By Harold Watters, Ohio State University Extension specialist
Corn insects we may see in July are European corn borer (I have seen a few in refuge plants already) and continuing to show up in northern Ohio is the Western bean cutworm. Earlier, I received calls from northeast Ohio on the appearance of Asiatic garden beetle larva feeding on corn in sandy soils. In past years we have seen this only in northwest Ohio. See your Corn, Soybean, Wheat and Alfalfa Field Guide for images and scouting suggestions.
If you are in continuous corn, watch for western corn rootworm. In areas west of us the pest has apparently overcome the Bt protection trait. Let us know if you see unexpectedly lodged corn this summer.
Last year we had rust (common and some southern), northern corn leaf blight and gray leaf spot did appear late and not do a lot of damage. With our wet weather, I think we will see corn leaf diseases soon on susceptible hybrids. The watch in soybeans is frogeye leaf spot. We have too many bean-on-bean acres so look for this disease and read these comments from Anne Dorrance: http://ohioline.osu.edu/factsheet/AC-53. I have already had questions about sudden death syndrome and Sclerotinia white mold.
- Sudden death: https://ohioline.osu.edu/factsheet/AC-44
- Sclerotinia: https://ohioline.osu.edu/factsheet/plpath-soy-3
- And the silent killer, SCN: https://ohioline.osu.edu/factsheet/AC-39
Read the Crop Observation & Recommendation Network newsletter for reports of disease and insect appearance across the state: http://corn.osu.edu.