Black grass bug damage to rangeland forage grasses, especially wheatgrasses, has been reported as reduced yield, plant height, seedhead production and seedhead height. Although forage quality parameters such as crude protein, acid detergent fiber and cell wall constituents have been determined for paired insecticide treated and untreated control plots, there has been no effort to correlate forage quality with BGB populations or damage. The objective of this study was to determine the relationship between BGB damage ratings and forage quality.