The Field Efficacy Trial of Several Fungicides for Controlling Rice Sheath Blight Disease(Rhizoctonia solani)

[Objective] The paper was to study the field efficacy of several fungicides against rice sheath blight( Rhizoctonia solani). [Method] Field efficacy trial was performed with three novel fungicides, 75% tebuconazole·azoxystrobin WG, 75% trifloxystrobin·tebuconazole WG and 24% thifluzamide SC, while 30% difenoconazole·propiconazole EC and 10% jingangmycin AS, which had been long-circulated in production, were used as control agents. [Result] The three novel fungicides had better control effects on sheath blight than the control agents; 75% tebuconazole·azoxystrobin WG at the dose of 20 g/667 m2 received the best control effect, and the control effect was still 87.72% at 20 d post administration, and the yield increase effect was remarkable. The control effects of 75% trifloxystrobin·tebuconazole WG and 24% thifluzamide SC were 85.67% and87.36%, respectively. [Conclusion] 75% tebuconazole·azoxystrobin WG, 75% trifloxystrobin·tebuconazole WG and 24% thifluzamide SC could be promoted as rotation fungicides to control rice sheath blight.