Triclopyr Safens the Use of Fluazifop and Fenoxaprop on Zoysiagrass While Maintaining Bermudagrass Suppression

Abstract

Three sequential applications of fenoxaprop (1.0 lb/acre), fluazifop (0.09 lb/acre), fluroxypyr (0.23 lb/acre), and triclopyr (0.12 lb/acre) applied on 28-day intervals were evaluated alone and in various combinations for bermudagrass suppression in zoysiagrass turf. Triclopyr safened the use of fenoxaprop and fluazifop on zoysiagrass turf without decreasing bermudagrass suppression compared to fenoxaprop or fluazifop alone. The addition of triclopyr improved fenoxaprop suppression of bermudagrass over fenoxaprop alone. While similar in chemistry to triclopyr, fluroxypyr was less phytotoxic to bermudagrass and did not provide beneficial safening of fenoxaprop or fluazifop. Based on this research, triclopyr should be utilized in combination with fluazifop or fenoxaprop to decrease injury from these herbicides and increase bermudagrass suppression when using fenoxaprop.