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  1. Invasive alien species are plants, animals, pathogens and other organisms that are non-native to an ecosystem, and which may cause economic or environmental harm or adversely affect human health. In particular, they impact adversely upon biodiversity, including decline or elimination of native species - through competition, predation, or transmission of pathogens - and the disruption of local ecosystems and ecosystem functions.
    Invasive alien species, introduced and/or spread outside their natural habitats, have affected native biodiversity in almost every ecosystem type on earth and are one of the greatest threats to biodiversity. Since the 17th century, invasive alien species have contributed to nearly 40% of all animal extinctions for which the cause is known (CBD, 2006).
    The problem continues to grow at great socio-economic, health and ecological cost around the world. Invasive alien species exacerbate poverty and threaten development through their impact on agriculture, forestry, fisheries and natural systems, which are an important basis of peoples' livelihoods in developing countries. This damage is aggravated by climate change, pollution, habitat loss and human-induced disturbance.

    Some of these species are dangerous plant pests and diseases that can affect both wild flora and cultivated crops severely. The European and Mediterranean Plant Protection Organization (EPPO) has prepared a poster and leaflet in order to raise public awareness about the risks of moving plants and their associated pests during international travel and to encourage responsible behaviour.

    One such hiker is the red palm weevil (Rhynchophorus ferrugineus)
    Curculionidae (Snout Beetle) They are recognized by their distinctive long snout and geniculate antennae with small clubs; beyond that, curculionids have considerable diversity of form and size, with adult lengths ranging from 1 to 40 millimetres (0.04 to 1.57 in).<br />
Weevils are almost entirely plant feeders, and most species are associated with a narrow range of hosts, in many cases only living on a single species. With so many species to classify and over 400 genera, the taxonomy of this family is quite complicated, and authors disagree on the number and placement of various subfamilies, tribes and subtribes.<br />
The word "weevil" has been made famous by the boll weevil, which lays its eggs and feeds inside cotton bolls, ruining the crop.<br />
[edit] Curculionidae,Insects,MACRO,Rhynchophorus ferrugineus,Snout Beetle,beetles,invasive species

    Update: some recent info from RMFelix about the situation in Portugal.
    This species has literally "cut" all Phoenix canarensis in portuguese territory. For the last 5-10 years the best fitossanitary treatment was simply to cut this exotic tree. Probably the beetle entered in south of portugal, where the first symptoms were first noticed. Today, from north to south, its very difficult to spot one Phoenix canarensis that isn't infected. Chemical and pheromone treatments are in most cases non efective. The quick answer to this problem was to eliminate the host plant. A few years from this part in all major cities the host plant was removed. In fact the beetle is still here, now struggling for survival ;) Just for curiosity, last year I've found in one tree that was cut 7 years ago (in my backyard) two full grown larvae! The resilience of this beetle is simply impressive.
    Rhynchophorus ferrugineus Rhynchophorus ferrugineus on a winter day...<br />
<br />
EXIF: Nikon Nikkor 50mm 1:1.8 E | f/8 | EXT I Curculionidae,Rhynchophorus ferrugineus,beetle,coleoptera,insecta,insects,invasive species
    Replied 6 years ago, modified 9 months ago
  2. Thanks for sharing this. Hereby another example of an invasive species:

    Pumpkinseed (dead) This pumkinseed was presented to me by a kid who was fishing at the pond I visited. Unfortunately, it is dead, although that does give a good view on its appearance. This fish is very popular in household aquariums. Unfortunately, when released in the wild, it is quite an invasive species that wipes out many other species not prepared for it. Therefore, many life forms will be happy to see this one dead. Geotagged,Heesch,Lepomis gibbosus,Macro,Pumpkinseed,The Netherlands,invasive species
    Replied 7 years ago
  3. Invasive plants

    The Common Water Hyacinth (Eichhornia crassipes) is a floating aquatic plant originating from South America sold for ornamental purposes. The plant is recognized as one of the most invasive alien plants in the world. It has huge detrimental economic impacts: it is a threat to agriculture, plant health, environment, public safety, recreation activities, water quality and quantity and human health.
    Water Hyacinths  Common Water Hyacinth,Eichhornia crassipes,invasive species

    The Butterfly Bush (Buddleja davidii) is a multi-stemmed shrub or small-tree that is native to China and has been introduced as an ornamental world-wide.
    Ecological Impacts: It has been planted in landscapes to attract butterflies, bees, moths and birds. It can escape from plantings and become invasive in a variety of habitats such as surface mined lands, coastal forest edges, roadsides, abandoned railroads, rural dumps, stream and river banks to displace native plants.
    Butterfly Bush  Buddleja davidii,Bulgaria,Geotagged,invasive species
    Replied 7 years ago, modified 7 years ago
  4. The Harlequin ladybird (Harmonia axyridis) is considered the most invasive insects in the world. It is native to Asia, but has been introduced to North America and Europe to control aphids and scale insects. It is now common and spreading in those regions.
    Impact: May cause the decline or extinction of native ladybird species. May cause a reduction in biodiversity as the Harlequin Ladybird is known to compete directly with other invertebrates for resources and by predation on small invertebrates including ladybirds, eggs and larvae of butterflies and moths and on aphids and other scale insects. They are an indirect pest of orchard crops which can affect the fruit quality and they can affect the taste of wine as they are difficult to remove from the clusters of grapes prior to harvest. In autumn/winter they tend to swarm and form large aggregations in buildings and are considered a nuisance.
    A survey has been organised in the UK to monitor it's spread.
    Harequin Ladybird A shiny red Ladybug climbs a plant. Coccinellidae,Coccinellinae,Harmonia,Harmonia axyridis,Insects,Invasive species,Ladybird

    Harlequin ladybird black  Bulgaria,Coccinellidae,Coccinellinae,Geotagged,Harmonia,Harmonia axyridis,Invasive species,Ladybird
    Replied 7 years ago
  5. In the land down under Australia we are as the rest of the World been hit by invasive creatures. There is a large list starting with rabbits, foxes, deers, rats, cats (which are one the most to blame for a lot of the native animals demise), dogs camels etc and who could forget the Cane Toad. Then we turn on the plants what with Blackberry, Prickly Pear etc . All these things plus more were brought here to make the new inhabitants feel at home. We in Australia have such a short history compared to the rest of the World but we are catching up. I will try to get photos or links. Replied 7 years ago, modified 7 years ago
  6. Some recently added species:
    The brown trout is an originally European species of salmonid fish.
    Brown trout close-up  Brown trout,Invasive species,Salmo trutta

    As Travis explained, they are quite a popular game fish in North America. They have been introduced into just about every major cold/cool watershed where trout live. They are hardier than many of the native trout and adapt very well. In many systems they have destroyed the native species. They are far superior in every way when compared to the native brook, rainbow and cutthroat trout. But there are many programs that are working to return these systems back to their once natural states, which include removal of invasives. It is a long, slow process, and sometimes not worth it, but other times it is!
    Brown Trout Mug Up close and personal with a female brown trout. We (the biologist I was working with and myself) sampled this trout while completing a population survey on the Priest River, Idaho. I just couldn't pass up the opportunity to take a click, as I never catch fish like this myself! This fish was released unharmed. Brown trout,Fish,Geotagged,Idaho,Invasive species,Salmo trutta,United States

    Another species, mentioned by Greame, is the cane toad.
    The cane toad, also known as the giant neotropical toad or marine toad, is a large, terrestrial true toad which is native to Central and South America, but has been introduced to various islands throughout Oceania and the Caribbean as well as northern Australia.
    Cane Toads  Cane toad,Invasive species,Rhinella marina
    Replied 7 years ago, modified 7 years ago
  7. Really cool that you're keeping this thread up-to-date, Wildflower! Replied 7 years ago
  8. There are probably many other examples that can be added. This is something very important to keep in mind.

    I just watched a documentary by Martin Clunes - Lemurs of Madagascar. He went looking for a gentle lemur - an endangered species in lake Alaotra. Reed, which is the lemur's habitat and food was being burnt out to create rice fields. An Asian snakehead, a species of predator fish has been introduced in the rice fields. Along with excessive fishing, it is the cause for the loss of many of the native endemic species.
    Replied 7 years ago, modified 7 years ago
  9. @Wildflower: Madagascar's wildlife really is in serious trouble, and that is still an understatement. It breaks my heart and frustrates me to no end that such unique wildlife is destroyed whilst it is so unneeded. It's like watching a train crash and just standing by it. Replied 7 years ago
  10. Large Thornapple Nasty stuff! Datura ferox,Geotagged,Invasive species,South Africa,Summer,datura ferox,invasive plants,weeds

    This also is an invasive species in many countries. Here in South Africa there are a huge amount of invasive plants and there have been massive attempts to eradicate them.
    Perhaps these should be on a list..or is there one already?
    Replied 7 years ago
  11. Dame's rocket is a very beautiful plant, yet it is an alien invasive that was brought to North America from Eurasia as an ornamental. It has spread widely throughout the United States and Canada.
    Dame's Rocket Dame's rocket is a very beautiful plant, yet it is an alien invasive that was brought to North America from Eurasia as an ornamental. It has spread widely throughout the United States and Canada. Geotagged,Hesperis matronalis,Invasive species,Non-native,North Dakota,United States,Wildflowers
    Replied 6 years ago, modified 6 years ago
  12. Great job, Wildflower! Keep updating the community on these non-natives and invasives! Replied 6 years ago
  13. Great job, Travis! Keep on providing them :)
    A small flower in the geranium family, this annual flower has been introduced to much of North America from the Mediterranean Basin and grows quite well in dry, high desert climates. This specimen was captured near Fort Smith, Montana.
    Common Stork's-bill A small flower in the geranium family, this annual flower has been introduced to much of North America from the Mediterranean Basin and grows quite well in dry, high desert climates. This specimen was captured near Fort Smith, Montana.  Common Stork's-bill,Erodium cicutarium,Geotagged,Invasive species,Montana,United States,Wildflowers
    Replied 6 years ago
  14. The states are a great place to find non-natives, especially plants and flowers. Many of them are brought over seas from all around the world for decorative and aesthetic purposes, and often spread from there. In the state of Florida alone, more than 500 fish and wildlife (not including plants) species have been observed!
    Replied 6 years ago
  15. Indeed these lovely water lilies are invasive in our local Puget Sound lakes, as are yellow flag iris and purple loosetrife (which I don't have photos of…)
    Fragrant white water lily on Lake Sammamish Fragrant white water lily - though lovely they are considered to be an invasive species on Washington's lakes. Geotagged,Invasive species,Nymphaea odorata,United States

    I'll have to get a photo of giant hogweed (a land invasive) - just because it's size can be quite impressive out here (flowers the size of umbrellas)
    Replied 6 years ago
  16. Japanese Knotweed or Mexican Bamboo (Fallopia japonica) This pretty flowering plant has been dubbed an invasive plant and is illegal to sell in many parts of the USA due to it's ability grow rapidly. It is very difficult to eradicate, therefore it tends to choke out more desirable plants. This photo was taken in the back yard of my parents house in Kane PA. Fallopia japonica,Geotagged,Invasive species,Japanese Knotweed,Reynoutria japonica,United States
    Replied 6 years ago
  17. Japanese Knotwood or Mexican Bamboo (Fallopia japonica) is considered to be a highly invasive species in the USA. Very difficult to kill, the spreading of this plant is mostly accidental. Just a small piece of its root can easily begin the spreading of this plant, now referred to as "killer bamboo". It chokes out other desirable plants and has no beneficial uses. Many states have made it illegal to sell. Replied 6 years ago
  18. I like dandelions but unfortunately it is an invasive species. Replied 6 years ago, modified 6 years ago
  19. Here's another invasive plant - the Himalayan balsam or Policeman's helmet. In the early 1800s it was introduced to many parts of Europe, New Zealand and North America as a garden ornamental, but has escaped cultivation and invaded natural areas. Himalayan balsam can completely cover an area and crowd out native vegetation.
    IN THE PINK PLANT KNOWN AS LONDONS PRIDE Geotagged,Himalayan Balsam,Impatiens glandulifera,Invasive species,United Kingdom
    Replied 6 years ago
  20. Most of the invasive species are introduced as garden ornamental and medicinal purposes. And one can see the reasons. The purple flowers of Himalayan balsam are beautiful. And dandelions are also one of the most versatile plants in terms of usage for medicinal purposes. We can only blame ourselves for these intrusions into the native environment. However, it definitely takes courage to recognize it along with taking steps to benefit our native fauna and flora. Replied 6 years ago, modified 6 years ago
  21. Kudzu was introduced to the United States from Japan in 1876 at the Philadelphia Centennial Exposition, as an ornamental plant. In early 1900s, it was recognized and promoted as a forage crop and planted throughout the southeastern U.S. In the 1930s and 1940s, the Soil Conservation Service paid southern farmers to plant kudzu to reduce soil erosion on deforested lands, resulting in over 1 million acres being planted. Kudzu, nicknamed “the vine that ate the South,” was recognized as a pest weed in the 1950s and removed from the list of acceptable species in the Agricultural Conservation Program. In 1998, it was listed as a federal noxious weed by the U.S. Congress. Kudzu occurs primarily in the eastern U.S. and has been reported to be invasive in natural areas from Connecticut to Florida and west to Texas. Infestations have also been reported in North Dakota and Oregon.
    Kudzu is widely believed to drastically reduce biodiversity because of its ability to smother other vegetation and develop large-scale monocultures. It can climb overtop and subsequently kill new seedlings or mature trees. Forestry problems associated with aggressive vines such as kudzu include mortality of edge trees, exclusion of native plant species, and potential to increase fire hazard during winter.
    Kudzu "The vine that ate the South"<br />
<br />
 Kudzu can grow up to 60 feet per season, or about one foot per day. It has no natural predators in the USA.<br />
<br />
Kudzu was intentionally introduced to North America by the Soil Erosion Service and Civilian Conservation Corp in 1876 for the purpose of controlling soil erosion. In the 135 years since its introduction, kudzu has spread over three million hectares (ha) of the southern United States, and continues to ‘consume’ the south at an estimated rate of 50,000 hectares (120,000 acres) per year, destroying power lines, buildings, and native vegetation in its path.<br />
<br />
Kudzu kills or damages other plants by smothering them under a blanket of leaves, encompassing tree trunks, breaking branches, or even uprooting entire trees. Kudzu’s ability to grow quickly, survive in areas of low nitrogen availability, and acquire resources quickly allows it to out-compete native species. <br />
<br />
 Over the years little success has been achieved in trying to combat the continuing spread of kudzu. However, there have been recent reports of a new bug inadvertantly imported from Asia in 2009 that eats kudzu. Unfortunately it also eats soybean plants as well and already have shown evidence of significantly reducing soybean production in some areas. The story of the benefits and the destructive nature of the kudzu bug will be unfolding over the next few years as the bug infestation spreads and means of controlling it are developed.<br />
 Georgia,Geotagged,Kudzu,Pueraria montana,United States,invasive species
    Replied 6 years ago
  22. Another example of invasive species is Silverleaf nightshade - Solanum elaeagnifolium
    Silverleaf nightshade - Solanum elaeagnifolium I saw this plant in Larissa, Greece, in the central park along the river.  I thought it is a decorative flower planted there intentionally. But it seems to be an invasive plant in Europe and is considered as a quarantine pest. It is included in the EPPO (European and Mediterranean Plant Protection Organization) List of pests recommended for regulation as quarantine pests.<br /> Geotagged,Greece,Invasive plant,Invasive species,Silver-leaf bitter-apple,Silver-leaved Nightshade,Silverleaf Nettle,Silverleaf nightshade,Solanales,Solanum elaeagnifolium,White Horsenettle,nature,pest
    Replied 6 years ago
  23. In the Florida Everglades there is the perfect example of an invasive species that is wreaking havoc on native fauna, and upsetting the balance of nature. Pronounced declines in a number of mammalian species have coincided with the proliferation of pythons in southern Florida, indicating the already devastating impacts upon native animals. Burmese pythons prey on a wide variety of birds, mammals, and crocodilian species occupying the Everglades. Nowhere else on the planet has such a large constrictor been introduced and established in a foreign locale.

    The Burmese pythons, released by pet owners, are multiplying like there is no tomorrow. Origianally first sighted in the 1980's there is no telling how many there now are. Some estimates are that there could be in excess of 300,000. WOW!
    business end this is the painful part of the snake Animal,Burmese Python,Invasive species,Python bivittatus,Python molurus bivittatus,cold blooded,natural,wildlife

    Replied 6 years ago, modified 6 years ago
  24. The Blue Jacaranda tree (Jacaranda mimosifolia) is regarded as an invasive species in parts of South Africa and Queensland, Australia, the latter of which has had problems with the Blue Jacaranda preventing growth of native species.
    Despite it's invasive spread, this species' status is considered vulnerable.
    South_African_tree Taken in South Africa Invasive species,Jacaranda mimosifolia,South Africa
    Replied 6 years ago, modified 6 years ago
  25. European paper wasp Sorry to say, yet another imported species…. these guys are relatively recent invaders, showing up here in Washington as late as the 1980's.  European paper wasp,Geotagged,Invasive species,Polistes dominula,United States

    The European Paper wasp - it's a relative newcomer to North America, (was unknown here until the 1980's) and at this point it's impacts on native paper wasps aren't entirely clear.
    Replied 6 years ago
  26. The European paper wasp (Polistes dominula) and the German wasp or yellow-jacket (Vespula germanica) are establishing in South Africa as well. People are trying to study their spread and stop them.
    Replied 6 years ago
  27. Another one, posted by @Paulien:

    Lupinus  Geotagged,Iceland,Invasive species,Lupinus nootkatensis

    In Iceland, the plant has been used to combat erosion. In some places, however, this has caused problems because of the lupin spreading too quickly. It is not native to Iceland but grows very well there. Since other plants find it difficult to root in the loose, eroded soil where it is generally planted, the lupine can grow unhindered and creates monocultures which prevent native flora to flourish.
    Replied 6 years ago
  28. The grey squirrel (Sciurus carolinensis) is native to deciduous forests in the USA and has been introduced to the UK, Ireland, Italy, France, Switzerland, Germany and South Africa. In the introduced range grey squirrels damage trees by eating the bark and in Europe they cause the local extinction of red squirrel (Sciurus vulgaris) populations through competition and disease.
    This species has been nominated as among 100 of the "World's Worst" invaders.
    Eastern Grey Squirrel (Sciurus Carolinensis) I love this photo, I know I took it, but I love it so much! I actually took this through my sister's patio doors when they were shut!!<br />
 Eastern gray squirrel,Eurasian Grey Squirrel,Geotagged,Invasive species,Mammals,Sciurus carolinensis,United Kingdom,bushy-tailed squirrel,eastern Grey Squirrel

    Grey Squirrel in Dublin Zoo A wild grey squirrel paying a visit to Dublin Zoo, Ireland Dublin,Dublin Zoo,Eastern gray squirrel,Eurasian Grey Squirrel,Geotagged,Invasive species,Ireland,Sciurus carolinensis,Zoo
    Replied 6 years ago, modified 6 years ago
  29. Cow grass Red Clover or Cow grass in the field. An introduced species that has become naturalized in all of United States and Canada with an exception of one province in Canada.  Invasive species,Red clover,Trifolium pratense

    The Red Clover is an introduced species to North America but it is not considered invasive. Not all introduced species have bad outcome for the native environment.
    Replied 6 years ago, modified 6 years ago
  30. WildFlower, I checked the Lists, but couldn't find such list: Invasive species! Is there a similar list or not? It is possible I missed it. Replied 6 years ago
  31. I only post them here, I haven't thought of making a list or a tag as well. Replied 6 years ago
  32. Blackthorn - Acacia mellifera - Invasive Beauty A Blackthorn (Acacia mellifera) in bloom during the start of the African summer.  This bush is considered an "invasive" species as basically it sucks up all the rain water surrounding its root system, and deny grass from growing around it as sunlight is also consumed first by the bush.  Because it prevents grass species from growing, its title as invasive and "problem bush" was given.  Naturally it also reproduces at a fast speed.     Geotagged,Invasive species,Namibia,Senegalia mellifera,Winter,bloom,flower,invasive,smell,sweet,white
    Replied 6 years ago
  33. Dead Man's Fingers Here's one to add to the invasive species list, though I'm not sure if on this beach it is. It's somewhat unclear to me if it's invasive on the Pacific coast of the US or not, but it is on the Atlantic. It is thought to have originated in the oceans near Japan. Codium fragile,Geotagged,Invasive species,Spring,United States

    "Dead Man's Fingers" I'm slightly unclear about whether this is an invasive in our intertidal zones out here in the west, but it is on the eastern coast of the US
    Replied 6 years ago, modified 6 years ago
  34. This post is mainly about invasive alien species which are non-native to an ecosystem. There are some native species which become invasive and colonyze their natural distribution area. This is the case with the species mentioned above Blackthorn - Acacia mellifera in Africa. Other species of Acacia however are invasive worldwide such as the black wattle or Australian acacia - Acacia mearnsii, but we don't have photos of it yet. Replied 6 years ago
  35. Dead man's fingers - Codium fragile ssp. tomentosoides is considered as an invasive marine alga as it has the capacity to spread rapidly via asexual reproduction and fragmentation, and has invaded many coastal waters including those of Europe and America. Its spread has also had a negative impact on benthic communities. C. fragile ssp. tomentosoides can become a dominant member in invaded habitats and can alter community composition and function. In addition, it can tolerate wide ranges of temperature and salinity which contribute to it becoming a dominant species when conditions permit.
    C. fragile ssp. tomentosoides has spread throughout the northern and southern hemispheres including the northeastern and northwestern Atlantic, the Mediterranean, Australia, New Zealand, the eastern central Pacific, and southeastern Pacific. In east Asia (Japan and Korea), where Codium fragile is a native species, its spread is restricted to areas where water temperatures are between 10-20°C (Lee and Kang, 1986; Segawa, 1996). However, when invading new habitats, C. fragile ssp. tomentosoides can withstand temperatures as low as -2°C (Fralick and Mathieson, 1972).
    Replied 6 years ago
  36. So yeah… I'm still not sure if it's considered to be natural spread that we have it on our beaches here - it is a long way from it's original home… but the route is not exactly restricted and the plant could have come here naturally. Then again we've had a big watch for invasive species on our beaches brought here with tsunami debris, so if it things to arrive with the currents, sometimes we still consider them to be invasive…
    I just found that it *is* considered to be introduced and invasive to California, so I'm guessing that it is here too. Perhaps it has not yet begun to present the problems that other places have with it yet. It is also possible that we do not have the subspecies "tomentosoides" which is apparently more problematic.
    Replied 6 years ago, modified 6 years ago
  37. Pretty little invasive  Common stork's-bill,Erodium cicutarium,Geotagged,Invasive species,Spring,United States

    These little flowers originated in the Mediterranean and have become an invasive in the American West. I can believe that. They were probably the most abundant of the wild flowers I saw on my hike.
    Replied 6 years ago
  38. Scotch Broom Native to Europe this was introduced to the US for ornamental and erosion control purposes… it proved to be far too successful. Scotch Broom is a pretty serious invasive here. It can outcompete even Himalayan blackberry (another wide spread invasive). In this county it is however only a class B noxious weed (so you may not plant it, sell seed etc, but landowners are not required to eradicate it). In other parts of the state it is more highly controlled because it affects grazing land by replacing native plants and because the seeds/seed pods are toxic to livestock. It grows especially well in cleared land. This was taken in a right of way under power lines, which to provide clear access for maintenance is mowed/cleared somewhat regularly. Scotch broom was nearly the only plant in the clearing. Common Broom,Cytisus scoparius,Geotagged,Invasive species,Spring,United States

    Somewhat serious invasive in the USA - one of the bigger problems is that it spreads rather quickly and is very difficult to eradicate once it is established.
    Replied 6 years ago, modified 6 years ago
  39. Coltsfoot introduced to the United States Coltsfoot,Geotagged,Invasive species,Spring,Tussilago farfara,United States

    Coltsfoot is native to several locations in Europe and Asia. It is also a common plant in North America and South America where it has been introduced, most likely by settlers as a medicinal item. The plant is often found in waste and disturbed places and along roadsides and paths. In some areas it is considered an invasive species.
    Replied 6 years ago, modified 6 years ago

    Another pretty little pink flower that is outta control :p - These little geraniums simply do too well in our Pacific Maratime climate.
    Replied 6 years ago
  41. European Cranefly more foreign invaders :p<br />
<br />
The cranefly known as the European cranefly in the Pacific Northwest, Tipula paludosa Meigan, is an introduced exotic pest first found in the region in 1965 in British Columbia, Canada.  Since then, it has gradually spread into Washington State and parts of Western Oregon and has become the most serious economic pest of lawns, pastures and hayfields in the northwest.<br />
<br />
This was my first bit of messing around with image stacking. When I came back I found I had several in pretty much the same position and more importantly in the exact same magnification. one focused better on the face, but missed the back, the other got the tail and back better. I figured nothing ventured nothing gained - together they are awesome and putting them together in Photoshop was a snap. Love those mathematicians and their algorithms. Now, this won't work if your subject moves around or if you move significantly, but it can be done hand held with a bit of care and luck. Geotagged,Invasive species,Seattle,Spring,Tipula paludosa,United States,Washington state,cranefly,fly,invasive species,tipula paludosa

    The cranefly known as the European cranefly in the Pacific Northwest, Tipula paludosa Meigan, is an introduced exotic pest first found in the region in 1965 in British Columbia, Canada. Since then, it has gradually spread into Washington State and parts of Western Oregon and has become the most serious economic pest of lawns, pastures and hayfields in the northwest.
    Replied 6 years ago
  42. Emerald Ash Borer The emerald ash borer (Agrilus planipennis) is a green beetle native to Asia and Eastern Russia. Outside its native region, the emerald ash borer (also referred to as EAB) is an invasive species and is highly destructive to ash trees in its introduced range. The emerald ash borer was first discovered in America in June 2002 in Michigan. It was accidentally brought to the US in ash wood used in shipping materials. Agrilus planipennis,Emerald ash borer,Invasive species

    Emerald ash borer, Agrilus planipennis, is an invasive borer from northeast Asia threatening North American and European ash trees (Fraxinus spp.).
    Replied 5 years ago
  43. I just learned this one...

    Squirrel A squirrel is looking for food in our garden.  Eastern gray squirrel,Fall,Geotagged,Invasive species,Sciurus carolinensis,United Kingdom

    The Eastern Gray Squirrel is native to North America, but is considered an invasive species in the UK, and a threat to the native Red Squirrel populations.
    Replied 5 years ago
  44. I have philosophical problems with the term "invasive species". Skipping the point that all life at one point or another was/is invasive, whether carried to a new location by man or bird, my question is : When does a species stop being 'invasive' and start to be 'endemic'?

    In Karnataka, India, almost all the national parks are overrun by Lantana camera. It is constantly referred to as an invasive species, but when probing into when and how it arrived I was shocked... It was thought to arrive around 1800 (give or take, it is debated via the British using it as an ornamental shrub). So... 200+ years later, it is still considered an 'invasive' species.... :/ I posed the question to a botanist working on species changes in Bandipur National Park. After much discussion, he said that in fact, there are no scientific rules as to what distinguishes an invasive or native species... there is no time-limit, only our perceptions. A species that nearly appeared in a location is definitely native, all others are invasive?. In the case of Lantana, i will completely agree it is an aggressive species, and has killed off a lot of the native grass species, but after 200+ years of growing in the wild, I personally do not characterise it as 'foreign' but 'indigenous'. it has been here so long, that it has integrated into the ecosystem, with the sambar deer having evolved to eat the bush, and it provides berries for a lot of birds too!

    Joe (above) mentioned the Gray squirrel in the UK.... For me, i grew up seeing these squirrels, and the red squirrel being exceptional rare. For me the Gray squirrel is not an invasive species anymore, but an aggressive native species.

    I'm sure there are thousands (if not millions) of examples, especially if you consider insects, so why are we drawing lines in the sand? Does it matter 'how' a species finds a new habitat (the negative role of humans is a debate for another thread). They are here, we can't change that now, all we can do is let biodiversity do what it does best... evolve.

    This is just my opinion, but as soon as any species lives in the 'wild' (outside of zoos or a captive environment), it is not invasive, just new. I have the same beliefs with immigration laws too! :)

    Replied 5 years ago
  45. I can see your point, to a point…. islands wouldn't have any life at all without "invasive" species that show up via wind, water or carried by visitors, but I think it becomes a problem when something from afar is artificially introduced and becomes destructive. When people bring species in that don't have any natural controls whole ecosystems can be brought to the brink. Australia has suffered tremendous species loss because of the introduction of rabbits. The bird population on Guam has nearly been eradicated (10 of 12 species extinct!) because of the introduction of rats and snakes. I could go on… forests, mollusks, food crops… so much can be threatened by taking an organism out of it's natural and competitive habitat and plunking it down somewhere where it flourishes and nothing eats it…. Replied 5 years ago
  46. Morpheme... would you have considered the rabbits an invasive species IF they had gotten to Australia under their own volition, 'naturally'? If so, would this not just be a case of Darwinian evolution? A natural process? I think the answer is no. if a species, under it's own migration/movement/motivation changes to a habitat more favourable for it, it can not be considered invasive. Do you agree?

    Now imagine, just for a thought experiment, that humans had not introduced rabbits to Australia, but that the rabbits had used us to get there (like trees making fruit for that birds will scatter their seeds)... Would you still consider them invasive in this case? I find it interesting to consider... because if the only reason for calling a species invasive is that humans have introduced it, we are holding ourselves in a 'god like' self-esteem. We are part of nature too, albeit not a great one to share a planet with. Just like the bird spreading the seeds of plants, we spread species too. Please forgive me, i am playing devils advocate a little here! :)

    Humans have screwed so many eco-system both deliberately and accidentally. What i don't understand now, is why we think that we can save them... We can't, we are not smart enough, it is impossible to conceive. What we can do, is give nature the chance to sort it's self, as it will. I don't believe in species conservation, but I do believe in conserving biodiversity and conserving the ability of nature to do its thing. :)

    I think I am getting off-topic.... I'm procrastinating at work, and enjoy these kind of philosophical arguments! :)
    Replied 5 years ago
  47. ps - i think tagging 'invasive' species is important.... it lets us know their spread. The exception for me are species in captivity (e.g. zoos). :) Replied 5 years ago
  48. Looks like there is indeed no clear scientific definition, just opinions. That's good for me, as I'm not a scientist :)

    My interpretation of 'invasive' is the combination of 2 things:

    a) An unnatural or unlikely introduction
    b) In a way that is destructive to the existing eco system

    With unlikely introduction I mean that under normal circumstances, the invasive species would never end up in the new eco system. We can debate what 'natural' means and count ourselves and everything we do as natural, but then we're just having a semantic discussion. Perhaps we can describe unnatural as not biological.

    When people in the Netherlands release a tropical fish into fresh water ponds, that is not a biological introduction. Not in any biological circumstance could that species have ended up in closed waters in a cold climate on the other end of the world. It's physically impossible.

    Even when we as people were still 'natural', nobody could have physically transported this fish and keep it alive this way. It is solely made possible by automated machines of transport, which are not natural in any way, at least by my definition :)

    The 2nd part of my interpretation is whether it matters. I believe the intention of the word 'invasive' is to indicate indeed that it is destructive. Nobody would care if the new species would neatly fit in. Invasive species usually don't fit in. In the example of the tropical fish, it kills every single living thing in the pond as none of the species have evolved any defense system for this species not belonging here.

    Another example is the Rose-ringed parakeet, the only tropical bird in the Netherlands. It doesn't belong here but somehow managed to survive. However, it does no harm nor does it destroy an eco system, so I would consider it "introduced", yet not invasive.

    Such events are not only caused by humans, but probably most of them are. At what point does an invasive species become native? I don't have an answer to that, other than some considerations:

    First of all, an invasive species can destroy large parts of an eco system within a single generation. Next, the invasive species comes out as victor and the losers go extinct. We wait a few generations, and at one point we consider the invasive species to be the new default. That would certainly reflect the reality of things, but this looks past the observation that it never should have happened in the first place. The invasive species becoming native had a high price.

    Second, you make it sounds like 200 years is a long time. Biologically it isn't, it's just a few generation whilst nature often needs many more to evolve an answer to changes. Expecting those changes to be relatively gradual, not sudden.

    Anyway, those are my thoughts on the definition.
    Replied 5 years ago, modified 5 years ago
  49. First, let me just say that I know that I'm in no way an expert on the matter. My policy for mentioning species in this thread so far (and will likely continue to be) that I defer labeling to outside sources.
    I have no problem with anybody else defining "invasive" differently than I do.

    Personally, I'd remove condition A from Ferdy's definition. If "Species A" comes to an area previously populated by "Species B" (and not "A"), and because of something "A" does, "B" starts dying out in that region, then "A" is invasive in that region. As soon as "A" starts reproducing in the area, I would also consider it endemic, but that wouldn't make it non-invasive (it's still relatively new to the region, and still doing harm to species that were there first).

    If I were the one defining what is invasive and what isn't, then I'd say (based on my limited knowledge)...
    In North America: The Gray Squirrel is indigenous, native, non-invasive
    In the (most of the) Southern UK: The Gray Squirrel is native, non-invasive
    In the (most of the) Northern UK: The Gray Squirrel is native in some areas, encroaching into others, and invasive

    I don't think invasive is necessarily bad (except for the short term effect on the species hurt by their introduction), and think it's unfortunate that invasive sounds so negative. There is a huge range on how negative (or positive) an invasive species can be when looking at the bigger picture.
    In the worst case, an invasive species wipes out several other pre-existing species in a region, and leaves no room for any other species to grow, reducing biodiversity in the region for centuries or more.
    In the best case, an invasive species only thins out another species, and by doing so helps the prey of that other species flourish, introducing better ecosystems for even more species, effectively increasing biodiversity in the long run.
    Replied 5 years ago
  50. I had a class in college that was title "Invasive Species". I thought I would share some interesting facts that I had written down in my notes, as well as some of my own opinions, which are just that, opinions.

    Invasive species - a species that causes harm or destruction to the ecosystem and it's native inhabitants

    Non-native species - a species that is introduced to a region, intentionally or unintentionally

    Endemic - a species that is native and restricted to an region

    Given these definitions, a species may be introduced to a region and not be invasive. In fact, statistics show (at the time of my course) that only 1 in 10 introduced non-native species become invasive. The other 9 may remain in their new ecosystem and either get along with pretty much all other species, or die out.

    The way I see it, a non-native species that is introduced to a region will always be just that, non-native. That doesn't mean that it won't become established and reproduce and become a part of the ecosystem. It just means that it will never be native, because it did not originate in its introduced range. Take for example the common pheasant Phasianus colchicus, known in North American as the ring-necked pheasant. The bird was introduced to North America in the late 19th century as a game bird with the intent of providing table fare. Throughout the continent, it is not considered to be invasive. Sure, it eats grains and grass seed and insects like some of the natives (turkeys, song-birds) but it doesn't out-compete the natives for these resources. In fact, in some regions, pheasant numbers are too low to keep hunters happy.

    Now, an example of a non-native that became invasive. Asian carp were brought to the southern United States several decades ago by aquaculturists to keep their rearing ponds a little cleaner. The carp (including bighead carp Hypophthalmichthys nobilis, silver carp H. molitrix) are filter feeders and filter out plankton in the water, and are quite effective at it. During flood events, these carp escaped from aquaculture settings and eventually moved into the Mississippi River system, where they started altering the ecosystem by filtering out plankton in the water. The place hit the hardest is the Illinois River. From its beginning in Chicago, to its confluence with the Mississippi River, the Illinois River is full of bighead and silver carp, and almost no other aquatic species. When the carp filter out the plankton in the water, juvenile fish of other species have nothing to eat, and eventually die out. When this happens, many of the larger and mature fish that are piscivorous (meaning they eat other fish) have nothing to eat and eventually start dying out. This then trickles into the terrestrial ecosystem, including birds and reptiles and mammals that eat the fish. Textile non-native species that was intentionally brought to North America, accidentally released into the wild, and became invasive.

    As for Joe's grey squirrel example, this is a good example of how a species can be introduced while hitch-hiking in it's own country. The eastern grey squirrel is indeed native to eastern NA. By hitching a ride with humans through western expansion, they were introduced outside of their native range throughout much of the continent. In some areas in the west, they out compete native red squirrels and douglas squirrels. So, one species on one continent, depending on where they are found, are native, non-native, and even invasive.
    Replied 5 years ago
  51. Thank you, Travis, that clarifies a lot. It largely resembles how I perceived the definition (invasive and introduced). Replied 5 years ago
  52. American Bullfrog This guy is an invader out here and likes to eat our smaller native frogs... Though I read recently somewhere that certain populations of Oregon Spotted frogs have been making a bit of a recovery due to the fact that the bullfrogs have forced breeding selection of larger spotted frogs by eating the smaller ones and now most of those areas adult Oregon spotteds no longer fit in a bullfrog's mouth :o  Evolution at work! American Bullfrog,American bullfrog,Geotagged,Invasive species,Lithobates catesbeianus,Rana catesbeiana,Spring,United States

    These guys didn't travel far. They came over to the West part of the US from the East, but they tend to out compete and eat our smaller native species out here. They apparently arrived through the pet trade and with trout stocking.
    Replied 5 years ago, modified 3 years ago
  53. Pet trade so often is the cause. Any counter measures in place? Replied 5 years ago
  54. Another example of a strongly invasive species:

    Opuntia stricta, Bundula, Sri Lanka This is an invasive species in Sri Lanka, and in particular in this location (Bundula). From Wikipedia:<br />
<br />
"In Sri Lanka it has overgrown a 30 kilometer long coastal area between Hambantota and Yala National Park, especially in Bundala National Park, a Ramsar wetland site. It has overgrown several hundreds of hectares of sand dune areas and adjoining scrub forests and pasture lands. Some areas are so densely covered that they are completely inaccessible for humans and animals. The seeds are spread by macaque monkeys, and perhaps other animals and birds, that eat the large fruits. It is also spread by people cutting down the cactus but leaving the cuttings, which then re-sprout where they have fallen. No control measures have been carried out except some costly manual removal of about 10 hectares on the dunes near Bundala village. The cactus is due to invade Yala National Park." Asia,Bundula,Erect Prickly Pear,Invasive species,Opuntia stricta,Sri Lanka
    Replied 5 years ago
  55. The Washington Fish and Wildlife site says attempting to eradicate bullfrogs is usually a futile effort... but does give some tips if you wish to attempt it. Apparently the meat trade was also to blame for bringing them to this particular state. In the 1930's during the depression some people tried out frog farming for meat, which was ultimately unsuccessful and the frogs were abandoned and escaped. We have nutria here for the same reason - fur farming was tried, but turned out to be unprofitable. The nutria escaped or were released and have thrived in the wild here. Replied 5 years ago
  56. Moist Iris Spring's arrival includes these beauties. Invasive species,Iris pseudacorus

    Iris pseudacorus is a perennial monocot forb that forms dense stands of robust plants. It thrives in temperate climates and can grow in water up to 25cm deep. It is a fast-growing and fast-spreading invasive plant that can out-compete other wetland plants, forming almost impenetrable thickets. Iris pseudacorus is poisonous to grazing animals and caution should be used if pulling out this plant as it causes skin irritations. It has typically been introduced as an ornamental, but has also been used in erosion control and for making dyes and fibre.

    Yellow flag is non-native in the U.S., and is spreading throughout the country.
    Iris pseudacorusis a wetland plant that is especially showy during its short blooming period. This good-looking plant has been transplanted into well-watered gardens all over the world and has widely escaped; it is also used in sewage treatment, and is known to be able to remove metals from wastewaters. Like cat-tails, yellow iris colonizes into large numbers, forming very dense monotypic stands, outcompeting other plants.;
    Replied 5 years ago, modified 5 years ago
  57. I am trying to set up an interview with a botanist that is an expert on invasive species... this topic has haunted my dreams long enough... do you guys have anything you would like me to ask them? :) Replied 5 years ago
  58. My main question would be how they are managed, if at all? A second question is after what time is an invasive species considered native? Replied 5 years ago
  59. Thanks... the second one was on my list, but the first is a good one! :)

    i'll let you know how it goes! :)
    Replied 5 years ago
  60. Any more questions about Invasive alien species... I'm interviewing the expert tonight... send over any questions!

    Replied 5 years ago
  61. very interesting thread. I have actually spotted the dreaded water hyacinth here, recognised it from Malaysia. this is how far it got!! Replied 5 years ago
  62. Mauremys sinensis, former Ocadia sinensis. An exotic / invader species for the portuguese territory.
    Mauremys sinensis Mauremys sinensis, former Ocadia sinensis. An exotic / invader species for the portuguese territory.<br />
<br />
Some creatures, like these beautiful turtles, are abandoned in the wild by humans who don't know the implications of such an act like this. With no predators to control exotic populations there is a real danger of losing other autochthonous / endemic species. This turtles feed themselves a lit bit like humans do... eating fruit, small crustacean, larvae, insects, grass... a lit bit of everything, putting in danger the survival of groups of other animals, that can't compete with that pressure. The specimen on the photo is a fully grown adult. This species can endure for more than 40 years... <br />
<br />
The pressure for survival of an endangered species... <br /> Animalia,Chinese stripe-necked turtle,Chordata,Cryptodira,Geoemydidae,Invasive species,Ocadia sinensis,Reptilia,Testudines,Testudinoidea,exotic animals,turtle

    It has also been released in Australia
    Replied 5 years ago, modified 5 years ago
  63. Black slug (Arion ater) These things should NOT be in Australia but were first reported in 2001 in the Dandenong Ranges 40km east of Melbourne. They were next seen in 2005 and now in 2012 I found dozens. There have also been reports of them in the Otway Ranges to the south-west of Melbourne. Regarded as a pest in Europe and England (their origin) they seem to have survived the worst drought in Victoria's recorded history and therefore might be regarded as 'established' here. <br />
I have just found out they are appearing in Tasmania too. What are sapiens doing.!! Arion ater,Australia,Black slug,Geotagged,Invasive species,Summer,introduced
    Replied 5 years ago
  64. Unfortunately Australia has the most sensitive ecology and the most aquisitive population.
    Some invaders are pretty though.
    Large quaking-grass (Briza maxima) A type of grass that produces these large clusters of seeds looking like cicadas on strings or fat bees. These ones are green but as they dry they take on a more insect-like colouring and actually rattle in the breeze. The top two segments are often much darker than the rest and give the appearance of large eyes. Leuba calls them rattle snake tails. The rest of the plant is a fairly simple grass growing to about 60cm high.<br />
Open semi-dry areas maybe with some light shade.<br />
Another invasive species introduced into Australia. Australia,Briza maxima,Geotagged,Spring,introduced,invasive

    Salsify (Tragopogon dubius) About 1 metre tall this plant had multiple stems each having few nodes with big inter-nodal gaps, Flowers started as single, spear-like cones with green bracts which open to expand a yellow flower later becoming a spherical creamy coloured head of seeds called a wishie or clock.<br />
Growing wild on a highway median strip under old plantation eucalyptus.<br />
<br />
European perennial naturalized and invasive throughout United States and Canada. Also called Western Goat's Beard, Wild Oysterplant, Yellow Salsify, Yellow Goat's Beard, Meadow Goat's Beard, Goat's Beard, Goatsbeard, Common Salsify, or Salsify. Young roots and stems may be edible. According to Atlas of Living Australia it occurs in Southern NSW.<br />
<br />
I do like the geometry of that seed head though. Australia,Geotagged,Invasive species,Spring,Tragopogon dubius,Western salsify,introduced
    Replied 5 years ago, modified 5 years ago
  65. Herb Robert is an invasive here. It escaped from gardens into the wild. It's a "Class B" noxious weed, which means that steps are being taken to keep it from spreading, but eradication is not mandated.
    Herb Robert Known here in Washington as Stinky Bob, it was introduced as an ornamental, but has become an invasive. It is classified as a "Class B noxious weed", which means that efforts should be made to prevent it's spread, but there is no mandated eradication program. Geotagged,Geranium robertianum,Herb Robert,Invasive species,Spring,United States
    Replied 5 years ago
  66. Box tree moth caterpillar  Box tree moth,Bulgaria,Cydalima perspectalis,Geotagged,Invasive species,Summer

    Box tree moth - Cydalima perspectalis Introduced in Europe and first recorded in Germany in 2006. Recently recorded in Bulgaria as well.<br />
This is not my photo - one of my employees captured it with her smartphone on the wall of our factory in Sofia. She knows how much I am interested in anything alive and made this photo for me. Her name is on the photo.<br />
There is a Wiki page for this species, but strange way, the JD record failed to create and I did it manually. Animal,Animalia,Arthropoda,Box tree moth,Bulgaria,Crambidae,Cydalima perspectalis,Europe,Geotagged,Insect,Insecta,Lepidoptera,Moth Week 2018,Nature,Sofia,Summer,Wildlife,invasive species

    The box tree moth, Cydalima perspectalis, is native to East Asia (Inoue et al., 1982). It was first recorded in Europe in 2007, in southwest Germany and the Netherlands (Krüger, 2008; Straten and Muus, 2010). Since then it has been recorded in many other European countries, and climate models predict further spread of the species in Europe, invading most areas except for Northern Fenno-Scandinavia, Northern Scotland and high mountain regions (Nacambo et al., 2014). In the newly invaded regions, C. perspectalis larvae feed on the leaves of box trees, Buxus spp., resulting in defoliation, which can kill the trees. The most significant damage, however, can be from the larvae attacking the bark of box trees causing the trees to dry out and die. Besides cultural and economic effects, the most serious threat from C. perspectalis is on the natural Buxus populations (Kenis et al., 2013). The species is easily introduced accidentally with its host plant, which is extensively traded over Europe and therefore presents a serious threat (Leuthardt et al., 2010; Straten and Muus, 2010).
    Replied 4 years ago
  67. Amazing how much damage a moth species can do, thanks for the update. Replied 4 years ago
  68. It has been a while since we haven't added any new species to this list so here is one.
    Lissachatina fulica (Férussac, 1821)  Achatinidae,India,Land Snails,Lissachatina fulica,invasive species

    Secret Revealed I used to wonder, these eggs belongs to which animal? whenever I used to see these eggs under the rocks near stream.. After this I think now I know the answer.. No more secrets.. ;-) <br />
You can see this snail laying eggs with natural adhesives to make sure it sticks there.. Amazing nature!!!<br />
<br />
Note: id: Achatina cf. fulica (invasive exotic snail sps. which got introduced in India back in 18th century) Achatina fulica,D5200,Geotagged,India,Lissachatina fulica,Nikon,NikonD5200,Summer,Tamron,abhitap,incredible india,incredibleindia,invasive species,karnala,life,maharashtra,nature,snail,wild,wildlife

    Achatina fulica – Giant African Snail Large snail on a section of cut bamboo.<br />
<br />
Location is Bandung, West Java, Indonesia. Alongside a stream and paddy fields.<br />
<br />
This snail is native to East Africa, but it has been widely introduced to other parts of the world. It is listed as one of the 100 of the World's Worst Invasive Alien Species. Achatina fulica,Bandung,Geotagged,Giant African Snail,Indonesia,Java,Lissachatina fulica,Spring,West Java,invasive species,snail

    The giant African snail Lissachatina fulica (former Achatina fulica) is listed as one of the 100 of the World's Worst Invasive Alien Species.
    Replied 3 years ago, modified 3 years ago
  69. Wow, That was very important information as one-day aliens would be ruling on us and we will be like slaves. Replied 3 years ago
  70. ashsingh, you may be joking about it but Invasive alien species can affect native biodiversity severely and contribute to the extinction of species. Replied 3 years ago
  71. Is there any way we can have "shared lists" or something as in that anyone can add species to it?
    It might be nice to have a list of species on JD that are considered invasive (pests) in their non-native ranges, but it would be easier if it could be set up as an collaborative effort.
    As an alternative for a (collaborative) list we might agree on some "standard tag" to indicate that the species depicted is considered "problematic" or some such, but this may not be as straightforward as one might hope.
    Some terms for tagging could possibly be:
    Invasive (=problematic)
    Introduced (=not necessarily problematic)
    Cosmopolitan (=has been around everywhere forever, even if not native)
    Together with tagging of a list we could then make an effort to update species info pages with a section on the perceived "invasiveness" so that this info is easily found by going from the photo to the species pages.
    Just brainstorming a little here ...

    For anyone interested: A few Dutch nature/wildlife conservation organizations issue a newsletter ("Kijk op exoten") specifically on invasive species. It is in Dutch but some of you may find it interesting nevertheless, if not for anything else just as a record of what is recorder from the Netherlands:
    Also, has special "portal" pages for this topic:

    Cheers, Arp
    Replied 3 years ago
  72. Hi Arp,
    There is one tag 110invasive species but it was added to only a few of the photos listed here. This is easy to fix but someone has to know about it and add it. Maybe Ferdy can come up with some ideas but he has a long "to do" list already.
    Replied 3 years ago
  73. Hi WildFlower,
    > but it was added to only a few of the photos listed here
    not anymore ... 110invasive species ;o)

    We have a number of other related tags ...
    18pest 7Invasive plant 5invasive plants 15invasive

    Maybe also see

    And not all images we have of the species/images tagged now are also tagged "invasive species", but maybe we don't necessarily _want_ that, but just have a few representative images of each species tagged as such ...
    22Nezara viridula 127Harmonia axyridis

    Replied 3 years ago, modified 3 years ago
  74. As I was working through, this I've added a few more species that may deserve mention in this thread as well:

    Stephanitis takeyai: Little Lacebug originating from Japann and invasive in EU and USA
    Stephanitis takeyai Stephanitis takeyai, full animal. Details of head here:<br /> Andromeda lace bug,Heteroptera,Lacebug,Netherlands,Stephanitis,Stephanitis takeyai,Tingidae,invasive species

    Stephanitis takeyai Nymph Last instar nymp of Andromeda lacebug Stephanitis takeyai Andromeda lace bug,Heteroptera,Lacebug,Netherlands,Nymph,Stephanitis,Stephanitis takeyai,Tingidae,invasive species

    Corythucha ciliata: A "New World" Lacebug invasive in Europe
    Corythucha ciliata Corythucha ciliata under bark of a Sycamore/Plane tree (Platanus) in France Corythucha,Corythucha ciliata,France,Heteroptera,Lacebug,Tingidae,invasive species,nl: Platanennetwants

    Corythucha ciliata Nymphs Old low quality image of Corythucha ciliata nymphs on the leaf of a Plane tree (Platanus) in France Corythucha,Corythucha ciliata,France,Heteroptera,Lacebug,Tingidae,invasive species,nl: Platanennetwants,nymph

    Nezara viridula: Believed to have originated in Ethiopia, now almost cosmopolitan
    Nezara viridula Summer Southern green stink bug (Nezara viridula) is one of the Pentatomid species that changes colour before finding a place to hibernate during winter. The summer colour seen here is bright green. The darker brownish/purpleish helps to camouflage the animal in leaf litter or in bark crevices etc.: <br /> France,Heteroptera,Nezara,Nezara viridula,Pentatomidae,Southern green stink bug,invasive species,nl: Zuidelijke groene schildwants

    Nezara viridula Nymphs Various development stages of the Southern green stink bug (Nezara viridula) France,Heteroptera,Nezara,Nezara viridula,Pentatomidae,Southern green stink bug,invasive species,nl: Zuidelijke groene schildwants

    Vespa velutina: Asian Hornet currently invading large parts of Europe
    Vespa velutina forma nigrithorax This is the colour form "nigrithorax" of Vespa velutina that is slowly taking over Europe. Rather old images (2011 I think) from France. Today I read the first confirmed sighting for the Netherlands. Asian predatory wasp,Hymenoptera,Vespa,Vespa velutina,Vespoidea,invasive species

    Replied 3 years ago, modified 3 years ago
  75. Anoplophora glabripennis Enschede 2008 This one was brought into an animal shelter in Enschede after being found in a city park. The surroundings were investigated for more beetles or exit holes as the species is under strict rules of monitoring and extermination in Europe. Anoplophora,Anoplophora glabripennis,Asian long-horned beetle,Cerambycidae,Coleoptera,Invasive species,Lamiinae,Monochamini

    The Asian longhorn beetle Anoplophora glabripennis is a large wood-boring beetle that is native to countries in Asia, such as Japan, Korea and China. It is one of the most dangerous pests affecting broadleaf trees in the world. The beetle spends most of its life within the inner wood of a variety of hardwood trees as larvae which tunnel and feed on the cambium layer, eventually killing the tree. It was first detected in New York 1996, although it is thought to have arrived in the 1980s in solid wood packing material from China. During the last decade, as trade flows increased heavily between China and many western countries, the importation of large amounts of untreated or inappropriately treated wood packing material containing living larval stages of pests, led to multiple accidental introductions of A. glabripennis in North America and in Europe.
    In North America and Europe, this quarantine pest is subject to eradication: each infested area is monitored periodically to identify newly attacked trees, which are cut and incinerated without delay. Beginning the first year of detection of the infestations in North America and Europe, great eradication efforts were implemented in each infested site. However, a few A. glabripennis adults and variable numbers of newly infested trees were discovered each year in most sites, even where the initial size of the infestation was limited. This means that eradication is not an easy process; it requires heavy and constant efforts of monitoring and tree cutting and destruction over several years. However, eradication is possible as it seems to have been achieved in Chicago (US).
    Replied 3 years ago
  76. Christine documented a high impact case of an invasive moth in eastern USA here:
    Gypsy Moth (Females) with Eggs Not a great shot as I took it with my cell phone! But, I wanted to upload it anyway to document the damage that these moths can do! <br />
<br />
These are female moths with their eggs. Females have white wings, a tan body, and approximately a two-inch wingspan. They cannot fly. Rather, they simply crawl to a spot near where they pupated, and wait for a male to find them to mate. After mating, female gypsy moths lay a mass of eggs. Each egg mass can hold over a hundred eggs.<br />
During the summer of 2016 in Rhode Island (northeast US), these moths, which are an invasive species, were literally everywhere. You couldn't go outside, day or night, without seeing them. All you could hear in the woods was the sound of caterpillars pooping up in the tree canopy - it sounded like rain.  Gypsy moth caterpillars wreaked havoc and caused incredible amounts of tree carnage - it was estimated that approximately 3/4 of Rhode Island's forest canopy was destroyed, making this the worst outbreak in at least 15 years. A single caterpillar can eat a square foot of leaf matter in one day - they prefer hardwoods, but will also eat conifers, many of which will not recover.   Geotagged,Gypsy Moth,Gypsy moth,Lymantria dispar,Summer,United States,moth
    Replied 3 years ago
  77. Here's another shot of the gypsy moths - male and female moths, eggs, and pupae:
    The Plague of Gypsy Moths - Eggs, Pupae, and Adults This shot is a bit gruesome - this doomed tree is covered in male and female moths, eggs, and a big pile of pupae. <br />
<br />
The females have white wings, a tan body, and approximately a two-inch wingspan. They cannot fly. Rather, they simply crawl to a spot near where they pupated, and wait for a male to find them to mate. After mating, female gypsy moths lay a mass of eggs. Each egg mass can hold over a hundred eggs. The males are brown and can fly - you can see one on the pupae.<br />
<br />
<br />
 During the summer of 2016 in Rhode Island (northeast US), these moths, which are an invasive species, were literally everywhere. You couldn't go outside, day or night, without seeing them. All you could hear in the woods was the sound of caterpillars pooping up in the tree canopy - it sounded like rain. Gypsy moth caterpillars wreaked havoc and caused incredible amounts of tree carnage - it was estimated that approximately 3/4 of Rhode Island's forest canopy was destroyed, making this the worst outbreak in at least 15 years. A single caterpillar can eat a square foot of leaf matter in one day - they prefer hardwoods, but will also eat conifers, many of which will not recover.  Geotagged,Gypsy moth,Lymantria dispar,Summer,United States,gypsy moths,moth,moth week 2018
    Replied 3 years ago, modified 3 years ago
  78. I have just uploaded an Invasive species: Elm Zigzag Sawfly larva - Aproceros leucopoda
    Elm Zigzag Sawfly larva - Aproceros leucopoda Invasive species. An abstract from a study, published in the European Journal of Entomology in 2010. <br />
<br />
"An invasive sawfly Aproceros leucopoda Takeuchi, 1939, which originates from East Asia, has colonized elms (Ulmus spp.) in Austria, Hungary, Poland, Romania, Slovakia and Ukraine, at least since 2003. In Europe, the larvae can completely defoliate native and non-native elm trees and may cause at least partial dieback. Field observations indicate that elms are infested independently of their age and site characteristics. The life cycle of A. leucopoda is described based on material reared in Hokkaido, Japan. <br />
Parthenogenetic reproduction, the short life cycle of summer generations and the ability to produce four generations per year result in the production of numerous progeny. The evolution of a seasonal dimorphism in head morphology, a simple cocoon that is attached directly to the host plant and a short period spent in the cocoon stage during summer, are putative apomorphies shared by Aproceros Takeuchi, 1939 and Aprosthema Konow, 1899. These traits reduce developmental costs and contribute to the proliferation of A. leucopoda. No specialized parasitoid, that can effectively reduce outbreaks of this species, is known. It is likely that this pest will spread into central and south-western Europe." Animal,Animalia,Aproceros leucopoda,Argidae,Arthropoda,Bulgaria,Elm Zigzag Sawfly,Elm zigzag sawfly,Europe,Geotagged,Hymenoptera,Insect,Insecta,Invasive species,Sofia,South park,Spring,Wildlife

    Apart from China, Japan and Kazakhstan, it is recorded already in almost all European countries:
    I'll try to find the wasp itself. According to published studies it used to fly around and produces 4 generations per year! I know exactly where I have found the larva and shall be glad to shoot the wasp as well.
    Replied 9 months ago, modified 9 months ago

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