Toxicity and Field Control Efficiency of the Mixture of Azoxystrobin and Procymidone Against Botrytis cinerea

Toxicity of the mixture of azoxytrobin and procymidone against Botrytis cinerea Per were determined by measuring the growth rate of mycelia,and the control efficiency of the mixture against Botrytis cinerea in the field were also studied.The results showed that mixtures of azoxystrobin and procymidone by ratios of 1.00∶2.00,1.00∶3.00,1.00∶3.75 and 1.00∶5.00 had synergistic effects on Botrytis cinerea,the CO-toxicity coefficient CTC are 140.06,148.42,167.90 and 126.69 respectively,were higher than 120.Furthermore,the field control efficacy of azoxytrobin and procymidone 30% SC was above 76% while the application dosage was 1 012.5~1 125.0 m L/hm2,no phytotoxicity to crops,and suitable for generalization and application in production.