July 30, 2015
Insects and mites
Numerous aphids feed on trees and shrubs in the landscape. They may occur throughout the season when plants are actively growing. Some are vectors for viral diseases of plants.
Aphid species range in size from about 1.5 mm to 4 to 5 mm (giant willow aphid).
Aphids suck plant sap from leaves and stems causing distorted growth, yellowing of foliage and premature leaf drop. Aphids also excrete honeydew, a sticky substance that sooty mold fungi can grow on.
Aphids have many natural enemies, including syrphid fly larvae, lacewings, lady beetles and parasitic wasps. Soaps, oils and other insecticides are also effective.
Print a PDF of this page: Aphids