Alfalfa Insects

Army Cutworm, Euxoa auxiliaris

Adult moth.

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.