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North Dakota Cutworm Identification
Here are brief descriptions and notes on the habits of the key cutworms (size is for full grown larva):
Army cutworm: 1 1/2 to 2 inches; pale greenish-gray to brown with pale stripes and mottled pattern. Larvae hatch in fall, resume feeding in early spring. Important in western North Dakota grain fields.
Pale Western cutworm: 1 1/2 inches; generally gray in appearance. Larvae hatch in spring. They feed underground, perhaps damaging plants before they emerge; cut plants are pulled underground. Important in western North Dakota small grain fields.
Darksided cutworm: 1 1/4 to 1 1/2 inches. Pale brown on top, lighter on the bottom. Sides have faint stripes. Larvae hatch in spring (mid to late May). Damage usually consists of cut stems and/or chewed foliage. Injure corn, sunflower, sugarbeet, and potatoes.
Redbacked cutworm: 1 to 1/4 inches. Dull gray to brown with dull reddish stripe down back. Larvae hatch in spring (mid to late May). Plant feeding same as above, same hosts.
Dingy cutworm: 1 1/4 inches. Dull, dingy brown color mottled with pale white spotting. Larvae hatch in fall, resume feeding in the spring when soils warm. Plant feeding same as above.
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