Late in the season the aphids migrate back to the original host plant, and a generation consisting of both males and females is produced. These individuals mate and the females lay eggs which will overwinter. Carefully inspect plants for the beginning of an aphid population buildup. When noticed you may start the use of a chemical spray program. If there are also large populations of ladybird beetles along with the aphids, chemical treatment may not be necessary.
Ladybird beetles are beneficial because both the adults and larvae actively feed on aphids.
Yellow sticky boards are also used as a monitoring tool for aphid populations. The insecticide malathion is recommended for control on most plants. Check the pesticide label for restrictions of the use on plants.