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Hemlock Woolly Adelgid (HWA)
The hemlock woolly adelgid (HWA) is an invasive, aphid-like insect. It was first reported in the U.S. in Virginia in 1951. In New England, the insect attacks and--over a period of years--kills eastern hemlock trees. Millions of trees have been infested or killed from Georgia to southeastern Maine.
Ecologist Dave Orwig oversees HWA research at the Harvard Forest and across southern New England.
Related projects include:
- A 2017 study on the impacts of HWA on water yield.
- A 2016 study on the impacts of forest pests nationwide.
- A 2014 book: Hemlock: A Forest Giant on the Edge
- Long-term hemlock removal experiment
- Harvard Forest Global Earth Observatory
- Hemlock eddy-flux tower
- K-12 education: "Woolly Bully" Schoolyard research protocol