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An important question in the management of wheatgrass monocultures during recent years has been the effect of the grass bug Labops spp. (Hemiptera: Miridae) on forage yields, forage quality, and stand longevity. Grass bugs occur throughout the Intermountain and adjacent areas (Bohning and Currier 1967; Denning 1948; Todd and Kamm 1974) and have been reported to cause extensive damage to crested wheatgrass (Agropyron cristatum) and intermediate wheatgrass (A. intermedium) stands in some areas (Knowlton 1967; Haws et al. 1973). Their effect on nutritional quality of forage has remained virtually unknown, although Todd and Kamm (1974) inferred significant short-term losses in a recent Oregon study. The study reported here was initiated to determine the effects of relatively low population densities of black grass bugs (Labops hesperius) on yield and nutritional quality of intermediate wheatgrass.

Yield and Nutritional Quality of Intermediate Wheatgrass Infested by Black Grass Bugs at Low Population Densities