Eastern hemlock trees are a vital foundation species in Pennsylvania forests, supporting the ecosystem and enhancing aesthetics. The hemlock woolly adelgid (HWA), an invasive insect, poses a ...

The new arrival was small and unassuming. In fact, if it weren’t for little white tufts visible on eastern hemlock needles, you’d have been hard-pressed to notice the newcomer. Then, the hemlock ...

The Hemlock Woolly Adelgid (HWA) is an aphid-like insect that feeds mainly upon Hemlock tree species. HWA was introduced into the eastern United States from Japan in 1951 by the import of infected ...