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grasshopper on corn; pest pressures

AUBURN, Ala.—Flooding in North Alabama, hurricane recovery in the Wiregrass and a mixed bag of other weather conditions have made for an interesting spring planting season. Farmers in the Wiregrass have corn stands on the verge of drying up, and other areas of the state are abnormally or moderately dry. A mild winter and warm spring bring about different-than-normal pest pressures for producers to manage in the field.

Mild Winter Leads to Heavy Insect Presence in Corn

Milder than normal winter temperatures allowed stink bugs and grasshoppers to survive and thrive this spring.

stinkbugs on corn; pest pressuresDr. Katelyn Kesheimer, an Alabama Cooperative Extension System entomologist, said brown and southern green stink bugs are showing up in corn right now.

“The stinkbugs were heavy in wheat,” she said. “Once the wheat is harvested, they move into corn to begin feeding. There are also decent numbers of brown marmorated stink bugs.”

Kesheimer said corn is most vulnerable to stink bug damage pre-tassel, although the crop can be damaged throughout the season. Stink bugs tend to be concentrated around field edges, so when scouting make sure to walk into the field to inspect a larger area. Pay special attention to areas near corn that stink bugs may move from – freshly cut wheat, weeds or tree lines.

Grasshoppers, similar to stink bugs, are an edge pest.

“If present in high numbers, it is important to control the nymphs before they get larger or cause too much damage,” Kesheimer said. “They can wipe out a field quickly and without warning. In times of drought stress and if significant defoliation is occurring, treatment may be warranted. Several insecticides will control grasshoppers.”

Each farmer will deal with different levels of pest pressures depending on their location.

Armyworms Found in South Alabama

Fall armyworms have already been found in treatable populations in Washington County, Alabama.

Kesheimer said it is crucial that producers scout their grasses using sweep nets to detect any fall armyworm populations while they are still young. Hot, dry weather like much of the state is currently experiencing creates favorable conditions for fall armyworms, so producers should be prepared.

Young caterpillars don’t eat much food and therefore don’t cause much damage. However, if a population goes undetected, it can seem as though they appeared overnight. They are bigger, harder to control with insecticide, and have the potential to cause substantial damage.

More Information

Find more information on insect pressures in crops and control options online at www.aces.edu. Contact your local Extension office for assistance in the field. Scouting guides can also be found on www.aces.edu.



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