Pestilence in Nature
This list includes organisms that are affected from any kind of affliction, such as parasitism or disease- including fungal infections, parasitism, galls, blight, cankers, leaf spot, mealybugs, aphids, mange, tick infestation, chytridiomycosis, mite infestation, white-nose syndrome, caterpillar infestation damage, parasitic plants, etc.
Christine Young created this list  7 years ago 
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  Ichneumon wasp cocoon 
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  Sea Leech 
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  Bullet Gall Wasp (Disholcaspis quercusglobulus) 
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  Infected Beetle Larva 
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  Cedar-Quince Rust - Gymnosporangium clavipes 
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  Spongy Oak Apple Gall - Amphibolips confluenta 
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  Galls of Cynipid Wasp - Dryocosmus rileyi/Kokkocynips rileyi 
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  Ophiocordyceps sp. on a Beetle Larva 
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  Not the Whaleshark 
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  Pine-Gall Rust 
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  Elm Gall Mite - Aceria campestricola 
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  Grasshopper infected with Fungi 
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  A Predatory fungi (Cordyceps sp.) tht has killed and consumed an ant in the Peruvian Amazon. 
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  Witch Hazel Cone Gall Aphid - Hormaphis hamamelidis 
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  Gall Midge - Asteromyia carbonifera 
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  Orange Blackberry Rust - Gymnoconia nitens 
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  Blueberry Stem Gall - Hemadas nubilipennnis 
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  Ash Bullet Gall Midge - Dasineura pellex 
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  Ophiocordyceps sp. (parasitizing a beetle larva) 
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  Wahoo stomach fluke, Gulf of Mexico. Composite image. 
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Rose bedeguar gall 
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Oak gall wasp (Andricus quercustozae) 
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  Sympetrum meridionale female 
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  A copepod parasite on a hatchetfish, Gulf of Mexico.