Aphids attack such a wide variety of plant material that it is not practical to list individual species. Some are winged during certain times of the year. Generally, aphids can be recognized by their cornicles, a pair of tube-like structures projecting from the rear of their bodies. Aphids feed by sucking sap from buds, leaves, twigs and developing fruit. Leaves may be stunted and distorted and fruit may become misshapen.
Aphids can also carry a number of plant viruses.
Though aphids undergo simple metamorphosis, the life cycle is often complex. In most species, winter is passed as eggs. Nymphs hatch out in April with several generations occurring through the growing season. Different generations may be winged or unwinged with the winged generation being the migratory stage. Aphids are usually controlled effectively by nature.