<P> Hemlock woolly adelgid ( Adelges tsugae ) , or HWA , is member of the Sternorrhyncha suborder of the order Hemiptera and native to East Asia . It feeds by sucking sap from hemlock and spruce trees ( Tsuga spp. ; Picea spp . ) . 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 ( Tsuga canadensis ) and the Carolina hemlock ( Tsuga caroliniana ) . HWA is also found in western North America , where it has likely been present for thousands of years . In western North America , it primarily attacks western hemlock Tsuga heterophylla and has only caused minor damage due to natural predators and host resistance . Accidentally introduced to North America from Japan , HWA was first found in the eastern United States near Richmond , Virginia , in 1951 . The pest is now found from northern Georgia to coastal Maine and southwestern Nova Scotia . As of 2015 , 90 % of the geographic range of eastern hemlock in North America has been affected by HWA . </P>
<P> Hemlock woolly adelgid ( Adelges tsugae ) , or HWA , is member of the Sternorrhyncha suborder of the order Hemiptera and native to East Asia . It feeds by sucking sap from hemlock and spruce trees ( Tsuga spp. ; Picea spp . ) . 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 ( Tsuga canadensis ) and the Carolina hemlock ( Tsuga caroliniana ) . HWA is also found in western North America , where it has likely been present for thousands of years . In western North America , it primarily attacks western hemlock Tsuga heterophylla and has only caused minor damage due to natural predators and host resistance . Accidentally introduced to North America from Japan , HWA was first found in the eastern United States near Richmond , Virginia , in 1951 . The pest is now found from northern Georgia to coastal Maine and southwestern Nova Scotia . As of 2015 , 90 % of the geographic range of eastern hemlock in North America has been affected by HWA . </P>
where did the hemlock wooly adelgid come from
where did the hemlock wooly adelgid come from
Japan
Japan