DNR - Check Trees for Hemlock Woolly Adelgid
Tue, 06 Apr 2021 17:31:29 EDT

A new forestry problem is emerging called Hemlock Woolly Adelgid, or HWA, an insect that can destroy trees.

HWA is considered a threat to Michigan’s Eastern Hemlock, and Department of Natural Resources officials are asking residents to check their trees, as the tiny insects secrete white wax as they feed on sap. HWA feeding also can kill needles, shoots and branches. Over time, tree growth slows as trees become less vigorous. Eventually, infected trees may take on a grayish-green appearance.

Quickly detecting and eliminating HWA can slow the spread of this insect. Eggs and very young adelgids can be carried by birds and can be moved on people’s clothing, hemlock nursery trees, logs or firewood. Hemlock trees can be protected from HWA with proper insecticide treatments.

For more information on identifying and managing hemlock woolly adelgid, visit Michigan.gov/HWA


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