Producers are urged to watch for armyworms in grass pastures, according to University of Illinois entomologists. Armyworms caused extensive damage to grass pastures in 2001 when producers were caught off guard. Learn more about the entomologists' suggestions for dealing with armyworms at www.ipm.uiuc.edu/bulletin/article.php?id=721.
Source: University of Illinois.
Variegated cutworms are causing problems in some Missouri alfalfa fields, says Wayne Bailey, University of Missouri entomologist. Variegated cutworm is an occasional pest of alfalfa following removal of first cutting. High moth numbers earlier this season have resulted in a limited number of fields with economic infestation levels. Identify the cutworm's larva by small yellow spots or diamonds running in a row the length of the back. Problems typically occur when larvae grow to a large size and feed on developing tillers as they emerge from the crowns of alfalfa plants following first cutting. Feeding can delay regrowth by two to three weeks and lack of alfalfa canopy often results in excessive weed growth. Variegated cutworms are present most years, but are often killed by insecticide applications for alfalfa weevils or potato leafhoppers.
True armyworms are also presenting some challenges in the state. Elevated numbers of these armyworm moths the past four weeks have resulted in economic infestations of larvae in fescue seed fields and grass pastures, wheat fields, and in seedling field corn.
Source: University of Missouri.