Cabbage aphid (Brevicoryne brassicae)
Green peach aphid (Myzus persicae)
Turnip aphid (Lipaphis erysimis)
Pest description and crop damage Both species are gray, mealy plant lice that form colonies on foliage, on heads, or in buds.
- azadirachtin (Neemix 4.5) at 0.01 to 0.02 lb ai/a. PHI 0 days. Begin applications at first sign of infestation. Multiple applications and thorough coverage are necessary for effective control. This botanical pesticide acts slowly. Spray early, well before harvest, and check for effect. Some formulations are OMRI-listed for organic use.
- gamma cyhalothrin (Declare) at 0.01 to 0.015 lb ai/a. Do not apply more than 0.12 lb ai/a per season. Suppression only. PHI 1 day.
- pymetrozine (Fulfill) at 0.086 lb ai/a (2.75 oz/a) when aphids first appear. Do not apply more than 0.086 lb ai/a per application or more than 0.172 lb ai/a per crop per year. Allow a minimum of 7 days between applications. PHI 7 days. REI 12 hr. Pollinator protection: when crops or weeds are in bloom, apply between 6 pm and 7 pm. SLN 24c WA-000017 expires 12/31/2020. Washington only.