Michigan: invasive hemlock woolly adelgid found at Benzie County country club

A new location of invasive hemlock woolly adelgid has been found in Benzie County, approximately 50 miles north of what was previously thought to be the northern edge of infestation in Mason County, Michigan. Northwest Michigan Invasive Species Network staff members conducting a winter survey for the pest detected the insects on hemlock trees at Crystal Downs Country Club in Frankfort.
The U.S. Department of Agriculture, Animal and Plant Health Inspection Service confirmed a sample taken from the site as positive for hemlock woolly adelgid on Jan. 27.
In 2021, a single tree infested with hemlock woolly adelgid was found at a campsite at the Sleeping Bear Dunes National Lakeshore in Benzie County. The tree’s infested branches were removed, and no signs of the insect have been found in subsequent surveys of the area.
Why be concerned?
Hemlock woolly adelgid is a small insect that uses its long, siphoning mouthpart to extract sap from hemlock trees. This feeding weakens needles, shoots and branches. Over time, tree growth slows, and trees take on a grayish-green appearance. Without treatment, infested trees die within four to 10 years. Read more







