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Hemlock Wooly Adelgid

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Why is our state tree (the Eastern Hemlock) in trouble?

The Eastern Hemlock is being attacked by the Hemlock Wooly Adelgid. This invasive aphid-like insect kills Hemlock by feeding on their starch reserves and injecting a toxin into them that causes their needles to drop more quickly. According to the article “Rehabilitation Guidelines for Hemlock Stands,” “Adelgids cause damage by depleting the Hemlock’s starch reserves.” When the starch reserves are depleted, the tree doesn't have enough energy to grow. The Hemlock Wooly Adelgid’s toxin causes needles to fall off the tree faster, as shown in the article “Forest Health Fact Sheet”. With less needles to perform photosynthesis in and not enough energy reserves to grow new ones, the tree is unable to store enough energy to live well through the dark winters, and it dies within a few years. …show more content…

“Hemlock wooly adelgid was first discovered in the eastern United States in Richmond, Virginia in the 1950’s, likely originating from a population in southern Japan”, according to the text “Eastern Hemlock Conservation Plan.” The insect is also invasive because it damages the ecosystem. Hemlocks are a major part of some forest ecosystems and provide some unique benefits, but the Hemlock Wooly Adelgid is killing Hemlocks throughout

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