Scouting for Soybean Insects and Diseases
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Corn earworm moth numbers are increasing. To see the 2023 black light trap data online. Among the locations, Pasquotank County has a trap with Crabbe Aviation on Foreman Bundy Road, and we thank them for their cooperation in providing this very useful information.
As for thresholds, there are a couple of things that you need to keep in mind. If you have insect pests that are only foliage feeders such as velvetbean caterpillar, soybean looper, bean leaf beetles, etc. then the threshold is based on percent defoliation for certain stages of plant development. The threshold for foliage feeding insects is 30% defoliation during the vegetative development up to two weeks prior to blooming (R1) and 15% defoliation two weeks prior to blooming until the pods have filled (R7-R8).
For corn earworms, which are foliage and pod feeders, as long as the soybeans are in the vegetative stage, we use the percent defoliation mentioned previously, but once the soybean are flowering or another part of reproduction, then we go with number of worms per sample. If you have a mixture of foliage feeders as well as pod feeders and you are in the reproductive stages of soybean, then use the threshold for corn earworms, which would be the number of worms per sample.
I have included the thresholds for corn earworm and stink bugs below. We have copies of a publication, “Soybean Insect Guide” at our office with the color pictures and information on the important soybean insects for our state. If you would like a copy, please contact us.