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Identifying Invasive Species-The Hemlock Woolly Adelgid

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Identifying Invasive Species-The Hemlock Woolly Adelgid

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The Hemlock Woolly Adelgid has been causing the increased mortality of Eastern Hemlocks throughout the East coast of the United States since 1951 (Orwig and Forester 1998). The Hemlock Woolly Adelgid attacks individual hemlock needles, interrupting the flow of nutrients, causing discoloration, loss of foliage, and the eventual death of the hemlock tree in just 4-10 years. The pest surrounds itself with a white cotton-like coating, which is only visible twice a year in the Spring and Fall. This coating is currently the only method of diagnosing the spread of the infestation.

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