Issue No. 13, Article 1/June 23, 2006
An Inventory of Field Crop Insect Issues in the Midwest
On June 20, extension entomologists from Illinois, Iowa, Michigan, Nebraska, and Wisconsin convened during a teleconference to share information about insect situations and issues in their respective states. A synopsis of the reports follows:
Illinois (Mike Gray, Kevin Steffey)
- Western corn rootworm adults beginning to emerge.
- Large numbers of Japanese beetles emerging, especially in southern Illinois.
- Low numbers of soybean aphids.
- Low numbers of European corn borers.
Iowa (Marlin Rice)
- Low numbers of soybean aphids. In some fields, the numbers were lower recently than they were two weeks ago.
- A few reports of sandhill cutworm infestations in corn.
- Large numbers of potato leafhoppers in alfalfa.
Michigan (Chris DiFonzo)
- Although alfalfa weevil problems were significant, reports of problems are declining.
- A few reports of armyworms in wheat, but the wheat looks very good.
- A few reports of armyworms and white grubs in corn.
- Soybean aphid numbers are low, although soybean aphids can be found in virtually every soybean field.
Nebraska (Bob Wright)
- Reports of problems with "miscellaneous" insect pests of corn (e.g., corn earworms feeding in whorls).
- European corn borer moth flight has passed its peak.
- First flight of western bean cutworm moths.
- Localized infestations of corn blotch leafminers, with some injury severe.
Wisconsin (Eileen Cullen)
- Problems with alfalfa weevils are subsiding.
- A few reports of armyworms in corn.
- Soybean aphid numbers are low.
This inventory is intended to provide a snapshot of insect issues around the Midwest. As always, please contact any of us if you have information to share.--Kevin Steffey and Mike Gray