European corn borers are considered as one of the most damaging pests of many vegetable crops including corn. Only larval stages of European corn borer cause serious damage to many crop species by tunneling through their leaf midribs and stalks. Second generation larvae are considered as the most damaging to late- planted corn because they tunnel into ears and stalks.
The European corn borers overwinter as mature larvae in tunnels made by them in corn stalks or stems of other host plants. As soon as temperature starts warming up, overwintering larvae pupate early in the spring and adults moths then emerge from these pupae in the late spring. Female moths then lay eggs on the lower surface of corn leaves in a cluster. Eggs hatch within a week into first generation small larvae that start feeding on the leaves and ear. When these larvae reach to the third or fourth stages, they start boring into stalks and midribs of leaves where they develop, mature and pupate. Then adults emerge from these pupae, and lay eggs on the lower surface of leaves. These eggs hatch into second stage generation larvae that develop through 5 developmental stages. Then these second generation mature larvae will overwinter and then life cycle will continue.