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Scout Info
Kentucky IPM Pest Information Pages

TRUE ARMYWORM : Kentucky Corn IPM

True Armyworm


Description

Larvae of the true armyworm are greenish brown with a narrow, mid-dorsal stripe and two orange stripes along each side. The yellowish head of the larva is honeycombed with dark lines. Armyworm larvae are about 1.5 inches long when full grown. Pupation occurs in the soil. Adult moths are nocturnal with a small, white dot in the center of each wing.

True armyworm larva

Damage

Armyworm larvae feed at night and damage corn by stripping the leaves and feeding in the whorl which may destroy the bud. Armyworms generally appear in Kentucky corn in early season, Mid-May through June. Infestations usually develop in small grains or other grass cover crops and in corn, infestations may develop throughout no-till corn following grains or grass crops. The larvae are most often found in luxuriant or lodged vegetation in low wet areas, and cool, wet springs will favor armyworm development. Armyworms are primarily leaf feeders; however, they will feed on awns and tender kernels. Other hosts of armyworms include wheat, bluegrass, oats, rye,and some forages. Remember: Larvae hide under debris or on the ground during the day and feed on the plant at night.

Armyworm Activity in Corn

True armyworm activity

Please note: These dates are approximations only. This calendar was constructed using data from Kentucky, USA. These dates may not apply in your area. You may wish to contact your county extension agent or agricultural consultant for information tailored to your locality.

IPM Techniques and Scouting Procedures

References and Additional Information


This site was created and is maintained by Pat Dillon, Department of Entomology, University of Kentucky, S-225 Agricultural Science Ctr North, Lexington, KY USA  40546-0091 (phone: 859/257-3571). Please send questions or suggestions to: pdillon@uky.edu