HPIPM:Variegated Cutworm FC

Author: Frank B. Peairs[1]

Identification (and life cycle/seasonal history)

The adult variegated cutworm, Peridroma saucia (Hubner), is a large moth with a wingspread of 45 millimeters (1¾ inches). The forewings of the moths have a light tan color and black markings. Two pale eyelike marks, separated by a black bar, appear in the upper middle of the front wings. The hind wings are silvery white. Larvae are ash-gray to dark brown in color with a distinct row of pale yellow spots along the back. Most have a broad orange stripe along each side of the body and frequently a dark W-shaped mark on the tip of the abdomen. Fully developed larvae are 38 to 45 millimeters (1½ to1¾ inches) long.

Moths emerge from overwintering pupae in the early spring. The adult females lay eggs in clusters of 40 to 70 on the stems of dead twigs, plant stems, and leaves. Depending on area temperatures, most eggs hatch within four to nine days. Larvae may feed and grow for 33 to 40 days until fully grown. Mature larvae enter the soil, form a cell and pupate.

Plant Response and Damage

The variegated cutworm is seldom a serious pest of corn. Unlike other cutworms, these cutworms climb the plant and feed on leaves, usually feeding at night. They may also feed on the tips and silks of developing corn ears. Often, defoliated or cut plants will be the only indication of their presence. The larvae may be found during the day hidden among surface litter, in loose soil, or under objects.

The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. Criticism of products or equipment not listed is neither implied nor intended. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Pesticides must be applied legally complying with all label directions and precautions on the pesticide container and any supplemental labeling and rules of state and federal pesticide regulatory agencies. State rules and regulations and special pesticide use allowances may vary from state to state: contact your State Department of Agriculture for the rules, regulations and allowances applicable in your state and locality.