European corn borer growth: time and temperature
Early reports indicate that populations of European corn borers are becoming easier to find now that the corn is getting taller. Shannon Gomes, a crop consultant in northeastern Iowa, reports finding an average of 1.06 larvae per plant in a field north of Waterloo. Other reports from our extension specialists in field crops indicate that a density this high is rare across the state. However, field scouts should inspect fields closely during the next couple of weeks and compare populations with the economic thresholds printed in the June 21, 1999, ICM newsletter.