Honeydew attracts ants, flies, wasps and other insects. Unsightly fungi called sooty molds often develop in honeydew, further disfiguring plants. The young aphids mature in about 10 days. Most aphids species have several generation per year. Both winged and wingless aphids are born during the growing season.
Winged forms migrate to start new colonies, usually on the same type of plant.
Some aphids, however, can move to an entirely different species of plant. Although most aphids attack the stems and leaves, a few feed on roots of certain plants. For example, the woolly apple aphids feeds on the leaves of elm trees and the roots and stems of crabapples, apples and pyracantha. Sometimes these parasites and predators are not able to keep aphids under control, so chemical control may be needed. The following sprays may be used to control aphids.