European corn borer moths began flying June 2 in central Iowa. Most of the corn is very short--V6 stage or smaller. Larvae hatching from any eggs laid on these small plants should not survive because of high concentrations of DIMBOA in most hybrids. Once corn reaches 17-21 inches in extended leaf height, survival of the larvae greatly increases and signs of leaf feeding injury can be found shortly thereafter. If Bt corn was planted, then larvae should not survive on any plant regardless of size. Next week I will discuss scouting and management options for this insect.

Female (left) and male European corn borers.