Cutting begins when indicated and lasts up to 2 weeks. Blue bars indicate when adults migrate to stands cut at different times of the year and how long they are present. Brood development depends on the time eggs are laid, which in turn depends on time of cutting. Red bars represent brood from early eggs that reach the adult stage from late summer to mid-fall. Green bars are brood from later eggs that overwinter as larvae and emerge the second year.
E indicates when egg laying begins.
A indicates when brood adults begin to emerge. In areas cut in July or after, migrating parent adults remain in the area through the following winter and spring causing seedling damage. Cornstalk borers are small grayish moths. The larvae live in the soil and feed on roots. In some areas of the south they may cause serious damage in nurseries.