Cottony maple scale on our Linden trees

Asked October 6, 2016, 8:48 AM EDT

We have noticed a white bumpy scale on the branches and twigs of our linden trees. The young tree in the front yard is especially infested while the more mature back yard trees are just beginning to show the white bumps. Will this harm our trees? What can we do? While walking around our town we notice many trees with this scale.

McLeod County Minnesota

1 Response

Thank you for the question. This looks like cottony maple scale. It can affect linden trees as well and can be a challenge to treat but you might not have to. Natural enemies usually keep the pest in check nor do severe infestations typically persist into the next year. Trees that are healthy to start with don't usually suffer damage to their overall health.
Having a certified arborist come out and evaluate the health of your trees might give you peace of mind and determine if your trees are healthy overall.

Thank you for contacting Extension.