The hemlock woolly adelgid was introduced to the U.S. from Japan around 1951.

Printable PDF Click on images to see larger view The hemlock woolly adelgid (HWA) is a serious pest of Canadian or Eastern hemlock, Tsuga canadensis, in the northeastern states.This insect was discovered in Connecticut in 1985 and has spread rapidly to both cultivated and forest hemlocks. HWA was first introduced from Asia into Virginia in the 1950s. This non-native invasive insect has caused significant hemlock defoliation and mortality in Pennsylvania forests. It has been found throughout the eastern United States. Adelgids are a small family of insects closely related to aphids and feed on plant sap.

Its egg sacs, which look like cotton balls or clumps of snow, can be found at the base of needles. Hemlock Woolly Adelgid (Adelges tsugae). Tom Coleman, USDA Forest Service, HWA is native to China, Japan and western North America, and was likely introduced to … Journal of Biogeography 29(10-11):1475-1487. The Hemlock Woolly Adelgid (HWA) is a devastating invasive tree pest in the eastern United States. 2000. Field surveys and evaluation of native and established predators of the hemlock woolly adelgid (Homoptera: Adelgidae) in the southeastern United States. The two predominant eastern hemlock species, eastern hemlock and Carolina hemlock, have no tolerance to the lethal effects of HWA feeding. Hemlock Woolly Adelgid. As its name suggests, the hemlock wooly adelgid feeds on hemlock trees, specifically the Carolina and Eastern hemlock. Silver Fly Insect Could Be the Pest Control Answer.

Wallace, M.S., and F.P. Landscape patterns of hemlock decline in New England due to the introduced hemlock woolly adelgid. Hemlock woolly adelgid is an aphid-like insect that attacks and kills hemlock trees.

Over the past 30+ years, HWA has killed tens of thousands of hemlocks.

Hain. Woolly Adelgid is an aphid-like insect that is a serious pest of the Eastern Hemlock, Tsuga canadensis, and its cultivars.Adelgids need to be controlled as this insect spreads easily and rapidly and, if left untreated, can kill a mature hemlock in 4-10 years.

HWA is an invasive species from Asia which has infested the US East Coast hemlock forest from New Hampshire to Georgia, inhibiting twig … Adelges tsugae (Hemlock Woolly Adelgid) - Fact Sheet. Since its arrival, it has wreaked havoc on the poor hemlock trees in the east. The hemlock woolly adelgid (Adelges tsugae) is a tiny aphid-like insect native to Asia. The hemlock woolly adelgid (Adelges tsugae) is a serious threat to our state tree, the eastern hemlock, in Pennsylvania and across the United States. Hemlock Woolly Adelgid Adelges tsuga.

When researchers found they may have an answer to this major problem, foresters were pounding on their doors to get a chance to try it out.

The Hemlock Woolly Adelgid (HWA) is a tiny, piercing and sucking insect, unseen with the naked eye, that feeds on hemlock twigs at the bases of the needles.