White fluffy balls on maple trees

Q. We have three younger maple trees and they all have these white web/sac like things on the branches. Do I need to worry about them or treat them somehow??

A. From your photo, it looks like you have Cottony Maple Scale. Trees are very tolerant to this scale and it does not usually harm them. It is generally managed by its natural enemies, which are certain beetles, wasps, and flies. Insecticides are rarely needed. Here’s a link to an article from Michigan State University to explain further.


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Warren Liken

With more than 40 years in the Green Industry, Warren offers a wealth of experience, passion, and expertise. He's one of a handful of Certified Arborists in the Great Lakes Bay Region, as well as an active member of the International Society of Arboriculture’s Michigan chapter. You can count on Warren and Bay Landscaping to solve your tree and plant issues.