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Hemlock Woolly Adelgid (HWA) Ovisacs - Adelges tsugae The white fluffy things at the bases of these hemlock needles are HWA ovisacs. They make the woolly covering to protect themselves and their eggs. There are also some adults along the stem in this photo - they look like black specks outlined in white. I took some home and will get some photos of them under the microscope.<br />
<br />
HWAs are invasive insects that feed on hemlock trees, which causes the needles to desiccate and prevents the growth of buds. This prevents new growth and causes tree death within 5-10 years. <br />
<br />
Hemlocks are a keystone species. They provide shade, shelter for animals, they cool the streams that they grow over, help prevent erosion,  and they are a source of food. They are a vital part of the New England forest system. The HWA is a major threat to the health of the trees.<br />
<br />
Habitat: Eastern hemlock; Dense, mixed forest<br />
<figure class="photo"><a href="https://www.jungledragon.com/image/114644/hemlock_woolly_adelgids_hwa_-_adelges_tsugae.html" title="Hemlock Woolly Adelgids (HWA) - Adelges tsugae"><img src="https://s3.amazonaws.com/media.jungledragon.com/images/3232/114644_thumb.jpg?AWSAccessKeyId=05GMT0V3GWVNE7GGM1R2&Expires=1627516810&Signature=di%2BDfPSCbFISbhswVZIb7q3PnbY%3D" width="132" height="152" alt="Hemlock Woolly Adelgids (HWA) - Adelges tsugae The little black speck is an adelgid.<br />
<br />
Habitat: Found on eastern hemlock (Tsuga canadensis); mixed forest<br />
<br />
https://www.jungledragon.com/image/114538/hemlock_woolly_adelgid_hwa_ovisacs_-_adelges_tsugae.html<br />
https://www.jungledragon.com/image/114645/hemlock_woolly_adelgids_hwa_-_adelges_tsugae.html<br />
<br />
Video of a nymph:<br />
https://vimeo.com/547720248 Adelges tsugae,Geotagged,Hemlock woolly adelgid,United States" /></a></figure><br />
<figure class="photo"><a href="https://www.jungledragon.com/image/114645/hemlock_woolly_adelgids_hwa_-_adelges_tsugae.html" title="Hemlock Woolly Adelgids (HWA) - Adelges tsugae"><img src="https://s3.amazonaws.com/media.jungledragon.com/images/3232/114645_thumb.jpg?AWSAccessKeyId=05GMT0V3GWVNE7GGM1R2&Expires=1627516810&Signature=m%2Bf03yHGRLyVxgga1rNxs7rg6Jc%3D" width="200" height="150" alt="Hemlock Woolly Adelgids (HWA) - Adelges tsugae The little black specks are the adelgids.<br />
<br />
Habitat: Found on eastern hemlock (Tsuga canadensis); mixed forest<br />
<br />
https://www.jungledragon.com/image/114538/hemlock_woolly_adelgid_hwa_ovisacs_-_adelges_tsugae.html<br />
https://www.jungledragon.com/image/114644/hemlock_woolly_adelgids_hwa_-_adelges_tsugae.html<br />
<br />
Video of a nymph:<br />
https://vimeo.com/547720248 Adelges,Adelges tsugae,Geotagged,HWA,Hemlock woolly adelgid,United States,eastern hemlock,eastern hemlock pests" /></a></figure><br />
<br />
Video of a nymph (crawler):<br />
<section class="video"><iframe width="448" height="252" src="https://player.vimeo.com/video/547720248?title=0&byline=0&portrait=0" frameborder="0"></iframe></section> Adelges,Adelges tsugae,Geotagged,HWA,Hemlock woolly adelgid,Spring,United States,adelgid,ovisac Click/tap to enlarge PromotedSpecies introCountry intro

Hemlock Woolly Adelgid (HWA) Ovisacs - Adelges tsugae

The white fluffy things at the bases of these hemlock needles are HWA ovisacs. They make the woolly covering to protect themselves and their eggs. There are also some adults along the stem in this photo - they look like black specks outlined in white. I took some home and will get some photos of them under the microscope.

HWAs are invasive insects that feed on hemlock trees, which causes the needles to desiccate and prevents the growth of buds. This prevents new growth and causes tree death within 5-10 years.

Hemlocks are a keystone species. They provide shade, shelter for animals, they cool the streams that they grow over, help prevent erosion, and they are a source of food. They are a vital part of the New England forest system. The HWA is a major threat to the health of the trees.

Habitat: Eastern hemlock; Dense, mixed forest

Hemlock Woolly Adelgids (HWA) - Adelges tsugae The little black speck is an adelgid.<br />
<br />
Habitat: Found on eastern hemlock (Tsuga canadensis); mixed forest<br />
<br />
https://www.jungledragon.com/image/114538/hemlock_woolly_adelgid_hwa_ovisacs_-_adelges_tsugae.html<br />
https://www.jungledragon.com/image/114645/hemlock_woolly_adelgids_hwa_-_adelges_tsugae.html<br />
<br />
Video of a nymph:<br />
https://vimeo.com/547720248 Adelges tsugae,Geotagged,Hemlock woolly adelgid,United States

Hemlock Woolly Adelgids (HWA) - Adelges tsugae The little black specks are the adelgids.<br />
<br />
Habitat: Found on eastern hemlock (Tsuga canadensis); mixed forest<br />
<br />
https://www.jungledragon.com/image/114538/hemlock_woolly_adelgid_hwa_ovisacs_-_adelges_tsugae.html<br />
https://www.jungledragon.com/image/114644/hemlock_woolly_adelgids_hwa_-_adelges_tsugae.html<br />
<br />
Video of a nymph:<br />
https://vimeo.com/547720248 Adelges,Adelges tsugae,Geotagged,HWA,Hemlock woolly adelgid,United States,eastern hemlock,eastern hemlock pests


Video of a nymph (crawler):

    comments (4)

  1. NICE! But not so nice ;) Posted one month ago
    1. Yep. I can't imagine our forests without eastern hemlock. Posted one month ago
  2. Fascinating find! Posted one month ago
    1. Thanks Ferdy. Posted one month ago

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The hemlock woolly adelgid , or HWA, is an insect of the order Hemiptera native to East Asia. It feeds by sucking sap from hemlock and spruce trees. In its native range, HWA is not a serious pest because populations are managed by natural predators and parasitoids and by host resistance. In eastern North America it is a destructive pest that threatens the eastern hemlock and the Carolina hemlock.

Similar species: True Bugs
Species identified by Christine Young
View Christine Young's profile

By Christine Young

All rights reserved
Uploaded May 9, 2021. Captured May 9, 2021 12:05 in Main St S Southbury Plaza Shopping Ctr, Southbury, CT 06488, USA.
  • Canon EOS 90D
  • f/13.0
  • 1/197s
  • ISO3200
  • 100mm