The Control Efficacy of 40% Flusilazole EC on Powdery Mildew in Flax

The control efficacies of 8000 times dilution of 40% flusilazole EC on powdery mildew in flax at different growth stage with 1,2,3,4 and 5 times applications were studied.The results showed that the lesser the times of application were,the lower the control efficacy was.The economic traits index,the proportion of good quality stems,the values of stem and seed also decreased with the reduction of application times.The value with four times application was higher than that with five times application.The optimal application began from rapid growth period of flax.The control efficacy was good,when the fungicide was applied each one times at rapid growth period,flowering period and blooming period.