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Invasive Insects Threatening Flight 93 Trees

The Park Service will spend the next several years working to suppress the spread.
STOYSTOWN, SOMERSET COUNTY – National Park Service staff are working with contractors to suppress the spread of an invasive insect which threatens trees at the Flight 93 Memorial.

Park staff discovered some hemlock trees were infested with the hemlock woolly adelgid (HWA), and will work over the next three years to treat 1,351 mature trees and many seedlings/saplings.

HWA infestations can be identified by their egg sacs, which resemble small tufts of cotton on the under hemlock branches. Infected trees frequently shift to a grayish-green appearance rather than the dark green color of healthy hemlocks.
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