Winter Timber Sale

Michigan DNR: Check for hemlock woolly adelgid

Landowners can treat for the invasive insect in the spring

The Michigan Department of Natural Resources (DNR) is suggesting that forest landowners survey their hemlock trees to check if they should be treating for hemlock woolly adelgid, an invasive insect from Asia. The insects “suck sap from hemlock needles and ultimately can cause tree death,” according to the DNR announcement.

This invasive insect can generally be treated in the spring with insecticide by landowners carefully following instructions found on the insecticide’s packaging. The insects have been seen in Allegan, Mason, Muskegon, Oceana and Ottawa counties.

The full text of the DNR’s advice, including specifics regarding insecticides, can be found here:

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