European corn borer larvae are hatching in south central Iowa according to Mike White, extension field specialist-crops. Also, I saw moths flying in Ames on the night of May 30. By the end of this week (June 10-11) females should be laying eggs throughout the state once the warm evening temperatures return.
Iowa State University
Rice, Marlin E., "European corn borers: How long before they tunnel into corn?" (2000). Integrated Crop Management News. 2054.
The Iowa State University Digital Repository provides access to Integrated Crop Management News for historical purposes only. Users are hereby notified that the content may be inaccurate, out of date, incomplete and/or may not meet the needs and requirements of the user. Users should make their own assessment of the information and whether it is suitable for their intended purpose. For current information on integrated crop management from Iowa State University Extension and Outreach, please visit https://crops.extension.iastate.edu/.