Bronzed cutworms have only a single generation each year. Fully-grown larvae are present by late April and pupation occurs during mid-August. Bronzed cutworms overwinter as eggs which hatch in early spring. There may be as many as three generations per year. Wind patterns (which affect the migration and ultimate distribution of the moths) and local environmental conditions strongly influence the severity of black cutworm infestations. Moths migrate northward from southern states in early spring and deposit clusters of 10 to 20 eggs on grasses and weeds. The black cutworm does not overwinter in Nebraska. Life histories of the various cutworms differ depending on the species. A row of yellow or white dots runs down the middle of the back.
The variegated cutworm is grey to brown with an orange lateral stripe and a series of darker lateral markings. The entire body has a distinctive bronze sheen. The upper surface has three narrow yellow stripes and a broad white-yellow stripe running down each side.
Bronzed cutworms are dark brown to black on the upper side of the body and paler on the underside. The black cutworm is dark gray to black with a pale stripe down the back, but with few other distinguishing markings.
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