Abstract: A method for biological control of pest grasses such as crabgrass using two species of a fungus selected from the genus Curvularia. The fungus is applied to the grass in amounts effective to produce typical plant lesions which kill or suppress, and thus control, the grass. The fungus may be administered with a surfactant or as granules, either of which may include additives such as glucose to enhance the pathogenic action of the fungus. Two species of the fungus are on deposit with the Department of Biological Sciences, Louisiana Tech University in Ruston, La. and with the International Mycological Institute in Surrey, UK and have been assigned the numbers MT-5 and CG-L.