Abstract: Virulence determination on three pathogens of grass diseases and field trials with six fungicides were carried out. The EC₅₀ of benomyl to Rhizoctonia solani and Colletotrichum gloeosporioides were 0.492 4 and 0.446 6 mg/L, respectively. The EC₅₀ of carbendazim to Rhynchosporium secalis was 0.413 0 mg/L. Carbendazim had the highest toxicity of the fungicides to Rhynchosporium secalis. The field control efficacy of 50% benomyl against Rhizoctonia solani and Colletotrichum gloeosporioides of turfgrass was 75.40% and 72.06%, respectively, while the control efficacy of 25% carbendazim on Rhynchosporium secalis was 76.97%.