Study of biological characteristics and biocontrol of the brown patch of turfgrass in Tianjin

The purified strain RH2 (Rhizoctonia solani) separated from the turfgrass was used to test the features including the suitable temperature, pH and carbon source in Tianjin. In order to resolve the problem caused by the chemical pesticide usage, 7 biocontrol preparations were used to screen the suitable ones. The result showed that suitable culture temperature was 30 ℃ and suitable pH was 6.5 to 7.5, suitable carbon source was sugar, soluble starch or lactose. Nisuo and Telike were the best biocontrol preparations through laboratory screening. The results of pot experiment showed that the control efficiency of Nisuo and Telike were 72.51% and 76.94% when the concentration was 1 500 times and 600 times respectively.