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 ...

The hemlock woolly adelgid, introduced accidentally in the 1950s, remains a major tree-killer in the U.S. In Japan, its population is controlled by natural predators and host tree resistance ...

Big picture view: One invasive species, the elongate hemlock scale ... If you suspect a tree or other greenery might be infested with an invasive insect or disease, you’re encouraged to contact ...