Antifungal activity of Azoxystrobin . Hexaconazole against Rhizoctonia solani in laboratory and its control effect in field.

The results of the toxicity test in laboratory showed that Azoxystrobin and Hexaconazole could be mixed at the ratio of 2∶3,1∶2 or 1∶3,and its EC50 and SR50 against Rhizoctonia solani were 0.00791 μg/mL and 1.55 respectively,when they were mixed in the proportion of 1∶2.The results of field test revealed that the 3 treatments of applying 24% Azoxystrobin·Hexaconazole SC at the dose of 375 mL/hm2 or 450 mL/hm2,and 24% Thifluzamide SC at the dose of 360 mL/hm2 had no significant difference in control effect against Rhizoctonia solani,but their control effects were significantly different from those of the treatments of applying 24% Azoxystrobin·Hexaconazole SC at the dose of 300 mL/hm2,10% Hexaconazole SC at the dose of 750 mL/hm2,and 250 g/L Azoxystrobin SC at the dose of 375 mL/hm2.The control effect of 24% Azoxystrobin·Hexaconazole SC at the dose of 375~450 mL/hm2(recommended dose) was similar to that of 24% Thifluzamide SC at the dose of 360 mL/hm2,but the former not only had low cost and high cost performance,but also could control false smut and rice blast.The application of 24% Azoxystrobin·Hexaconazole SC at the proper dosage was safe to rice plants,and could promote the leaf greening and growth of rice.