Study on 5 Kinds of Fungicides Bioassay on Rice Sheath Blight

The control efficiencies of 5 kinds of fungicides which were 24% thifluzamide(SC),20% azoxystrobin and 12.5% difenoconazole(SC),50% tebuconazole and 25% trifloxystrobin,43% tebuconazole,15% propiconazole and 15% difenoconazole against rice sheath blight were compared,aiming at finding out the fungicide to control rice sheath blight more effectively on mid-season rice in Jianghan Plain area.The results showed that,the EC50 of the 5 fungicides were 0.0335,0.0354,0.0733,0.4434, 0.9006mg/L respectively,in field trials,the control effect were 51.98%,83.7%, 71.05%,59.97%,61.09% respectively after 14 dsprayed with recommended dosage. Although 24% thifluzamide(SC)had a higher inhibitory effect indoor against rice sheath blight,32.5% azoxystrobin and difenoconazole(SC)had higher control effect in the field.