Overview info and resource documents for the hemlock woolly adelgid, originally from Asia, which was first discovered in the eastern U.S. in the 1950’s. It has since spread throughout the range of hemlock in the East, and caused extensive mortality of mature hemlock – especially in the Appalachian Mountains.

HWA is a serious pest of hemlock trees in Georgia. The aphid-like insect feeds on eastern and Carolina hemlock trees, eventually resulting in tree mortality. The very existence of the eastern and Carolina hemlock species is greatly threatened by HWA.

Managing hemlock woolly adelgid (HWA) can involve use of insecticides. When it does, the non-target impacts (negative effects to other organisms) need to be thoroughly considered
and weighed against the environmental cost of inaction or alternative management approaches. Insecticides applied for HWA management are used for conservation purposes, which may seem counterintuitive. However, hemlocks are a key forest species, and so their loss can result in severe ecological consequences. To justify insecticide use against HWA, we have to ask: What are the possible negative consequences of using insecticides in the forest? We must consider these trade-offs in hemlock management. It is important to remember that there will be trade-offs in any kind of resource management discussion, even if it may not initially seem apparent. The negative environmental consequences of hemlock mortality must be weighed against the known consequences of insecticide use to preserve hemlocks.

The Young Harris College (YHC) Hemlock Proiect is a volunteer effort of community members and students to help raise Sasajiscymnus tsugae, a tiny ladybird beetle that is one of the few natural predators of the HWA. The organization works in conjunction with the Forest Service and GFC to decide where to release the adult beetles.

Get help with Hemlock Woolly Adelgids. View list of vendors.