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Wheat Insect Update

Wheat Insect Update published on No Comments on Wheat Insect Update

by Sebe Brown, Extension Entomologist

All, I have been seeing more instances of true armyworms infesting wheat in the North Louisiana.  These include wheat plots at St. Joe and Winnsboro at various stages of growth.  Our threshold for armyworms is 5 worms per square foot with foliage loss occurring. If armyworms reach the flag leaf and the wheat has not headed an application should be made.  I have also encountered varying levels of stink bugs (primarily rice stink bug) in wheat. Populations of stink bugs have to be high for damage to occur and our threshold is 10% infested wheat heads in the milk stage and 25% infested heads in the soft dough stage.  Stink bug numbers  will usually be higher around the edges of a field with numbers falling off as you walk further toward the middle. This means you may reach threshold around the edges of a field, but may also be well below threshold 100 feet in.  Applications of pyrethroids can control both of these pests.

Rice stink bug  photo courtesy of Gus Lorenz

Armyworm larvae on wheat heads photo courtesy of Robert Bellm, University of Illinois Extension

 

 

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