Cabbage aphid

The Mealy aphid (Brevicoryne brassicae)is a destructive aphid (plant louse) native to Europe that is now found in many other areas of the world. The aphids feed on many varieties of produce, including cabbage, broccoli, Brussels sprouts, cauliflower and many other members of the genus Brassica, but do not feed on plants outside of the Cruciferae family.

Control
Different varieties of cultivars have varying resistance to Brevicoryne brassicae. Diaeretiella rapae is a common wasp parasite of cabbage aphids. Other controlling insects include ladybird beetles, syrphid fly larvae, and lacewing larvae. Some insecticidal soaps may be effective in treating aphid infestations.