Armyworm Reports Continue in Cornfields and Wheat Fields

June 9, 2000
We've had a few reports this week concerning armyworm injury to corn. Some of the cases fit the "classic" scenario for potential development of problems with true armyworms. Phil Miatke and Vaughn Palmer, crop specialists with Carroll Service Company, Carroll County, reported (June 2) to Ria Barrido, technical specialist with Growmark, that two cornfields were "hit hard" by true armyworms. Each field had been planted to rye last season. This spring, the rye was treated with a burndown herbicide and the field planted to corn. Armyworms are especially prone to injure seedling corn that has been no-tilled into a standing grass cover crop such as rye or in fields that had intense grassy weed pressure at planting time. Armyworm moths prefer to lay their eggs in very dense, grassy vegetation and can also pose a threat to wheat growers every year. For a full report on the life history and management strategies for armyworms, consult issue no. 8 of the Bulletin.--Mike Gray

Armyworm larva.

Armyworm injury to corn planted into a rye cover crop.

Severe defoliation of corn caused by armyworms.

Author: Mike Gray