The white cottony growth on twigs, branches, and leaves in the fall is often caused by a group of wooly aphids. The aphids are covered with a waxy filament. Many have complex life cycles and it is common to see them on twigs of apple, crabapple, beech, and other trees. It is not worth treating for them in the fall, as they rarely cause significant harm to the plants.This article was posted in Tree Insects.
Department of Entomology