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Northern Research Station
One Gifford Pinchot Drive
Madison, WI 53726
(608) 231-9318
(608) 231-9544 TTY/TDD

Hemlock Woolly Adelgid

Additional Resources

Podcast

Hemlock Woolly Adelgid

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  • Kelly van Frankenhuyzen
  • talks with U.S. Forest Service experts about hemlock woolly adelgid and it's impacts on eastern hemlock forests.
  • Andrea Hille, Silviculturist, Allegheny National Forest, Pennsylvania
  • Nathan Havill, Research Entomologist, Northern Research Station, Hamden, Connecticut
  • Therese Poland, Research Entomologist and Project Leader of Ecology and Management of Invasive Species in Forest Ecosystems research work unit, Lansing, Michigan

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Images

[photo:] Hemlock woolly adelgid winged adult. In Japan, this form flies to spruce where there is a sexual generation and galls are formed.

 

Hemlock woolly adelgid winged adult. In Japan, this form flies to spruce where there is a sexual generation and galls are formed.


[photo:] Hemlock woolly adelgid gall on tigertail spruce in Japan

 

 

 

Hemlock woolly adelgid gall on tigertail spruce in Japan


[image:] Diagram of adelgid life cycle. Click on image to view larger version.

Diagram of adelgid life cycle

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Last Modified: 09/12/2017