Maple tree weird

Asked July 21, 2016, 6:26 AM EDT

What is this

Rutland County Vermont

1 Response

Thank you for contacting eXtension. Common on maple leaves, the spindle galls you see are caused by microscopic mites called eriophyid mites. The galls form in early spring when the leaves begin to expand and the mites begin feeding on the leaf tissue. The growth of the galls has little effect on the health of the trees.