HWA: Symptoms of Infestation
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HWA egg sacs (white woolly masses at the base of needles on undersides of hemlock twigs)
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HWA causes premature needle drop, twig dieback and defoliation
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HWA infestation results in off-color needles, often with a grayish cast
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Death of hemlocks due to HWA in Great Smoky Mountains National Park