Larvae hatch and begin feeding 3-6 days after oviposition. Cutworms have a wide host range and most field crops are acceptable hosts. Two black dots of unequal size on each segment are indicative of black cutworm . Additionally, black cutworms are typically found below ground, while dingy cutworms feed above ground on foliage. Feeding occurs primarily at night, and larvae rest under the soil surface during the day.
Several generations are common in Minnesota, but only the first is of economic importance.
Damage The most significant damage caused by cutworms is the cutting of seedling stems above or below the soil surface. Large populations are capable of decimating an entire field, as a single caterpillar can cut several seedlings. Cutworms can also be found feeding on foliage, but this damage seldom causes economic injury to crops. Sampling Procedures Cutworms are difficult to control because they must be detected early to prevent damage, and outbreaks are sporadic. Cutting typically begins in mid-May in Minnesota, and fields scouting for damage should begin at this time.