Hemlock Woolly Adelgid (E3300)

Hemlock Woolly Adelgid (E3300)

A little insect that means big trouble for hemlock trees in Michigan.

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Hemlock woolly adelgid (Adelges tsugae Annad) has been on Michigan’s “most unwanted” list for years. This invasive forest insect has killed hundreds of thousands of hemlocks (Tsuga canadensis) in eastern states. It threatens more than 170 million hemlock trees in Michigan forests, and if not controlled, it will also kill hemlock trees in landscapes. Small, localized infestations of hemlock woolly adelgid (HWA) were recently discovered in western lower Michigan. Evidence suggests that some of these infestations are at least 10 years old and probably originated when infested hemlock trees from other states were planted in landscapes. Surveys are continuing, and additional HWA infestations may yet be found. This bulletin is designed to help you learn to recognize HWA and understand the potential impacts of this invader in Michigan.

 

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