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Department of Entomology

Department of Entomology
123 W. Waters Hall
1603 Old Claflin Place
Kansas State University
Manhattan KS 66506-4004

785-532-6232 fax

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Alfalfa Insects

Army Cutworm, Euxoa auxiliaris

 Army cutworm adult

Adult moth.

Army Cutworm Larva

Late instar larva feeding on alfalfa.

Damage occurs in late January, February, March, and sometimes into April. This pest is usually more of a problem in south central Kansas. Worms may destroy small plants. Foliage damage can reduce harvest from the first cutting of older alfalfa. Detecting the infestation before the foliage is destroyed is critical for control success. If possible, controls should be applied when larvae are above ground. Seedling stands suffer the most damage. Treat when two or more larvae per square foot are present in seedling fields, or four or more per square foot are found in established fields. More detailed information on the life history and biology of the army cutworm can be found in KSRE publication MF3150.

Please refer to the most recent Alfalfa Insect Management Guide for specific control options.

Page last updated 1/4/2014 by J.P. Michaud.