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Forest Health Protection—Hemlock Woolly Adelgid

Distribution Maps

Maps showing newly infested counties:

Progression of infestations over a time span:

Range Expansion

HWA Predicted Range Expansion
Historic Spread of HWA
Click here for an animation showing the spread of HWA from 1951 to 2006.

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Page Contact: Keith Tackett

June 30, 2011