Beech blight aphids are found on a beech twig at Kohler-Andrae State Park in Sheboygan County, Sept 5, 2025. / Photo Credit: Wisconsin DNR

By Bill McNee, DNR Forest Health Specialist, Oshkosh
Bill.McnNe@wisconsin.gov

Late summer and fall is the time of year when fluffy “beech blight aphids” become very noticeable on American beech trees (Fagus grandifolia) in the eastern quarter of Wisconsin, where the tree species occurs.

These large aphids grow white, waxy filaments from their abdomens and feed in a colony on the branches of beech trees. When disturbed, they all shake their abdomens in an attempt to scare off predators. This behavior has led to the insect being commonly known as the “boogie woogie aphid.”

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