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.

Chinese (Ligustrum sinense), European (Ligustrum vulgare) and Japanese (Ligustrum japonicum) privets are all listed as invasive-exotic species that threaten native South Carolina forests. These are semi-evergreen, multi-stemmed shrubs or small trees that can grow up to a height of 20 feet. Ligustrum sp. are native to China, parts of Europe and Japan, and were first introduced into the United States around 1909 for ornamental use as shrub borders, erosion control plantings and wildlife forage. Characteristic flowers of Ligustrum species are showy, panicles of tiny, creamy-white flowers that are very fragrant and abundant in late spring through summer. Fruit produced are small, rounded dark-purple berries that persist throughout the winter, especially favored by birds.