Comparison of Field Efficiency with Ten Fungicides Controlling Rice Sheath Blight

In order to screen excellent,low-toxic and safe fungicides for controlling rice sheath blight(Rhizoctonia solani Kuhn),the field trials of ten fungicides controlling rice sheath blight were carried out according to GB/T 17980.20-2000 and adding the efficiency of sickness plant(SPE).The results showed that the field efficiency of azoxystrobin 250 g/L SC was 87.53%.The field efficiencies of five fungicides,such as coumoxystrobin 20% SC,propiconazole 25% EC,difenoconazole 10% WG,tebuconazole 80% WP and triadimenol 15% WP,were 71.97%-79.59%.The field efficiencies of three fungicides,such as thiophanate-methyl 70% WP,validamycin 10% AS and thifluzamide 240 g/L SC,were 63.92%-66.78%.The last one was prochloraz 15% ME and its field efficiency was 46.73%.The trend of SPE and field efficiency was consistent.All ten fungicides were safe to rice plant.So azoxystrobin,coumoxystrobin,propiconazole,difenoconazole,tebuconazole and triadimenol were recommended to control rice sheath blight.Coumoxystrobin had been priority.In order to retard resistance,mixture or rotation was beneficial.