Vegetable Crop Insects

Joanne Whalen, Extension IPM Specialist;

Continue to sample for cabbage looper, diamondback larvae and harlequin bug. Be sure to scout and select control options based on the complex of insects present in the field.

Be sure to watch for an increase in cucumber beetle and aphid populations. A treatment should be applied for aphids if 10 to 20 percent of the plants are infested with aphids with 5 or more aphids per leaf.

Lima Beans
Continue to scout for stinkbugs, lygus bugs and corn earworm. Economic levels of stinkbugs and earworms can be found. Since trap catches remain high, multiple applications will be needed for earworm control.

With the high corn earworm and corn borer moth catches in blacklight traps throughout the state, be sure to maintain a 5 to 7-day schedule on all peppers for worm control. Also, be sure to select materials that control both earworms and corn borers.

Snap Beans
With the high corn borer and corn earworm moth catches, you will need to consider a treatment for both insect pests. Sprays are needed at the bud and pin stages on processing beans for corn borer and corn earworm control at this time. As a reminder, if you are using Orthene (acephate) for corn borer control in processing snap beans, it will not provide effective corn earworm control. Call the Crop Pest Hotline or check our website for the most recent trap catches in your area to help decide on the spray interval between the pin stage and harvest for processing snap beans (

Both webworms and beet armyworms are active at this time and controls need to be applied when worms are small and before they have moved deep into the hearts of the plants. Also, remember that both insects can produce webbing on the plants. Generally, at least 2 applications are needed to achieve control of webworms and beet armyworm.

Sweet Corn
With the high corn earworm catches throughout the state, all fresh market silking sweet corn should be sprayed on a 2-day schedule.