Rains kept many farmers out of their fields this spring as a result in some cases the corn crop is less developed than usual. That increases the chance for insect and pest damage, says Ron Hammond, Ohio State University Extension entomologist.
Hammond urges crop growers to take extra care to scout their fields this spring for insects and invasive pests, including a relatively new pest that has shown up in unexpected areas across Ohio that has the potential to cause significant economic losses for growers.
In addition to cereal leaf beetle, alfalfa weevil and black cutworm, growers need to be on the lookout for Asiatic garden beetle grubs, which are especially aggressive in their feeding habits, says Hammond.
"We've had more calls about alfalfa weevil than in previous years, with quite a few people cutting early to help stem the pests," Hammond says. "And we've had reports of Asiatic garden beetle grubs that have caused stand losses in corn fields in Tuscarawas County, which is much further south than we expect to find them.
"We always assumed Asiatic garden beetle grubs were in north and northwest Ohio, parts of Indiana and Michigan, but we've now found them in much wider area. We recommend growers throughout the state check corn in sandy soils, particularly paying attention to fields in river bottom areas where sandy soils are often found."
Some of the invasive and damaging pests that growers can expect this year include:
* Asiatic garden beetle grubs: Last year was the first known instance of Asiatic garden beetle grubs causing significant stand losses in corn in northern Ohio just below Lake Erie. Growers who planted corn following soybeans in sandier soils reported last year finding Asiatic garden beetle grubs that caused some stand losses. What's surprising about this is that the grub, which is a species that is more associated with being a minor pest in turf, now appears to be much more damaging to crops than most other grubs. At the present time, similar to other grub problems, there is not a rescue treatment available, and the only action would be replanting if necessary. Most of the grubs should be pupating shortly.