Remarks
Hemlock Woolly Adelgids - Adelges tsugae
This species is a type of Woolly Aphid that prefers conifers, called an Adelgid see also see: http://www.insectimages.org/search/action.cfm?q=Hemlock%20Woolly&Start=76&results=15
Some species produce characteristic galls on conifers like the Cooley Spruce Gall (Don't know species name). See http://www.insectimages.org/browse/subimages.cfm?SUB=480 from insectimages.org. for some photographic examples of the Cooley Spruce Gall insects.
They congregate on the bark and branches of my Western Hemlock. I also believe that they are mostly western in distribution. The week of 10/1/06, the winged form was flying...This stage doesn't seem to last long.
These insects can become so numerous, that they eventually can kill a full grown tree.
Internet References
Here are a few links that look good for information on this species:
I will also post a comment quoting 2 books that refer to this species some time this week.
ISSG Database: Ecology of Adelges tsugae (Many tabs with lots of info)
Nature Conservancy
USDA site for invasive species
also can use the US Forestry site on the "Bugwood network" (photos from insectimages.org, for instance)
I couldn't get any of these "Bugwood" links to go where I wanted...
Contributed by Cheryl Moorehead
