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About when were the wooly adelgids introduced to the US and how are they spreading?
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About when were the wooly adelgids introduced to the US and how are they spreading?

User CustardBun
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Answer:

The wooly adelgids were introduced to the US in about 1951.

Step-by-step explanation:

HWA was introduced into the eastern United States from Japan in 1951 by the import of infected hemlocks. Since its introduction, HWA has spread to 17 states (from Georgia to Maine) and causes the large-scale mortality of Native Eastern and Carolina hemlocks.

User Jasonwarford
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