Stink Bugs in Corn
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Stink bugs are present in corn this year and many are questioning whether a spray is worthwhile. In most situations, spraying stink bugs in corn is not worthwhile. The following logic will support this.
Corn is most susceptible to stink bug injury pre-tassel when the ear is forming. Stink bugs are very good at finding developing tissue. When the ear is forming, stink bugs will pierce the wall of the stalk and feed on ears developing inside the stalk. This can cause cells that have not yet developed to form the ear to be destroyed. This sort of injury is very damaging, since the entire ear can be deformed. However, most of my stink bug calls occur post-tasseling. At this point, the ear is already developed and has emerged so that the silks can receive pollen from the tassels. Stink bugs at this point are still targeting developing tissue, but the developing tissue is now kernels, rather than the ear. We can tolerate a lot more kernel feeding than we can feeding on developing ears. Sometimes stink bugs can transmit fungi that lead to aflatoxin, but I feel that environmental conditions (such as drought and hybrid) are much bigger drivers of aflatoxin problems than stink bugs.
Stink bugs are difficult to kill with aerial applications because they are made using low volumes and because the insects can hide in leaf folds near the stalk. We have published information from NC that demonstrates the ineffectiveness of typical aerial applications over corn. Stink bugs can be killed for up to a week using a high-clearance tractor (see screening information graph). If you absolutely have to do something about stink bugs and cannot use a high-clearance tractor, do everything you can to get your aerial applicator to increase coverage and penetrate the canopy. Don’t expect much, if any, residual from your chemical. Stink bugs can reinvade the field after sprays.
Most stink bug infestations occur on field edges. Not many folks are willing to walk hundreds of feet into a corn field to scout for insects. However, stink bugs really pile up on the edge of corn because they move among weedy hosts in field edges and other crops. If you notice stink bugs on the edge of a field, walk a ways into the field to see if they are just piling up on the edge or if they are present throughout.
Our threshold for spraying stink bugs is one stink bug per four plants when the ear is forming, during ear elongation and the beginning of pollen shed and one stink bug per two plants nearing the end of pollen shed to the blister stage. I am willing to shift this threshold up to one stink bugs per 10 plants when the ear is forming to be extra protective. Numbers this high are still rare.