Control Effects of the Complex Formulation of Thifluzamide and Tebuconazole on Rice Sheath Blight

[Objective] The aim was to study the control effects of the complex formulation of thifluzamide and tebuconazole on rice sheath blight.[Method] The toxicity of the complex formulation of thifluzamide and tebuconazole on Rhizoctonia solani was determined by mycelial growth method and the field trials were performed.[Result]The results showed that the EC50 for thifluzamide and tebuconazole in inhibiting mycelial growth of R.solani were 0.139 3 and 0.135 6 μg/ml,respectively.The toxicities of these reagents were similar.The synergistic factors ranged from 0.8283 to 2.535 0,indicating obvious synergistic effect.The field trials showed that 225-375 g/hm2 complex formulation provided 88.04%-97.61% control efficacy based on the synergistic factors,higher than that of the single reagent.[Conclusion] The complex formulation of thifluzamide and tebuconazole with 5∶1 had good control effects on rice sheath blight.