Gray-green to powdery blue. Soft-bodied, covered with a fine whitish wax.
Aphids cluster on the underside of leaves.
Throughout United States, particularly troublesome in the south. Winged female aphids infest fields, giving birth to live, mostly female nymphs at the rate of about 25 per week over a 2 to 3 week period. Nymphs reach maturity in 7 to 14 days and begin the cycle again. Numerous generations are produced in this manner over a season. Cabbage aphids overwinter as eggs in crop residue.