There are many natural enemies that feed on these pests. Aphids are a fairly common problem on apples. There are two major kinds that can build up to fairly high numbers during the summer. Both of these aphids have green bodies. The adult aphids may have wings or be wingless.
Aphids are common on the tender young leaves on branch tips and on watersprouts.
While feeding, the aphids produce honeydew. This is a liquid rich in sugars. Black sooty mold often grows on the honeydew. Aphids have many generations a season. Aphids are attacked by lady beetles, syrphid fly larvae and other predators and parasites.