In this program you do not need to count actual numbers of aphids on a leaf but need only to determine if aphids are present. The program also reduces the number of samples required when aphid populations are low. For each plant, simply record if the aphid is present or not. Use the table below to determine need for treatment or continued sampling. If you take 50 samples and still don't reach a decision, wait until the next sampling date to make a decision.
Treatment is more effective after topping because coverage is greatly improved.
Rotating pesticide materials may effectively help slow the development of resistance. For broccoli, Brussels sprouts, cabbage, cauliflower. For broccoli, Brussels sprouts, cabbage, cauliflower. Only partial control. May be phytotoxic on Brussels sprouts and cabbage.