Subscribe and stay up-to-date with the latest news and great offers from DEKALB, Asgrow and Deltapine.
Don't miss out on the latest agronomic news.
Local agronomic alerts.Delivered straight to your inbox.
Growers should scout fields as soon as cotton begins to bloom and apply an insecticide if bollworms are observed to help maintain yield potential.
Larvae are roughly 1.5 inches long and can vary in color from light green, pink, or brown to black with stripes running along their back (Figure 1).
In corn-growing regions, bollworm moths will typically deposit eggs in cotton fields after emergence in nearby cornfields. Eggs are deposited on upper leaves and hatch after three days. Eggs and larvae may be found anywhere on the plant, especially on blooms or young bolls.
Figure 1. Bollworm on a cotton boll. Peggy Greb, USDA Agricultural Research Service, Bugwood.org.
For both methods, be sure to remove and check bloom tags as they can hide larvae.