![]() There appears to be a second generation of larvae occurring in late summer and fall that are present in soil and cause stand reduction when fall grasses are sown. ![]() Larvae feed for 1 to 3 months, depending on soil and ambient temperature. They clip roots underground and pull foliage into the soil. They also feed by day on some crops like table beet seedlings. Later, they move to the soil and feed at night above ground at the soil surface. In the first week or two, the small larvae tend to stay above ground on a host plant. Young larvae feed and survive on many grasses and broadleaf plants. Stand loss can occur if seedlings are clipped off repeatedly or if the growing points are destroyed.īiology and life history Apparently, either moth or pupa may overwinter in the Pacific Northwest or moths migrate into the region during late spring females deposit eggs during this time. Even a few larvae in an area can cause substantial clipping and defoliation. Larvae feed at night, hiding in soil or resting under clods or plant residue by day. Generally, one can expect black cutworm larvae in fields where no-till and conservation tillage follow these cropping regimes. Larval populations are often in soil when grass is seeded in summer or early fall and follows fallow ground with weeds, legumes, crucifers, sugar beets for seed, pasture, or other grass seed crops. This cutworm, one of the most common species in western Oregon, is a pest of new seedlings. The adults of this moth are brownish gray with a spot and a light silvery band on the front wings. By day, they hide in the soil or under plant debris on the soil surface. They can be gray, brown, or black and have lighter brown stripes running the length of the body. Pest description and crop damage Black cutworm larvae are 1.2 to 1.6 inches long when mature.
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