Annual Bluegrass (IMAGE) University of Tennessee Institute of Agriculture Caption Annual bluegrass is one of the most common weeds of turfgrass on golf courses, and it has developed resistance to common herbicides, threatening the profitability of the turfgrass industry that serves golf courses, sports fields and sod farms as well as commercial and private landscapes. Credit Photo by G. Breeden, courtesy UTIA. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.