Control Efficacy of Fungicides against Cucumber Powdery Mildem in Facility
The cucumber powdery mildem is an important fungal disease in cucumber production.In order to select efficient fungicides to control the disease and offer a useful reference in future,this study used 70%thiophanate-methyl(WP),50%kresoxim-methyl(WG),42.8%triflumizole-trifloxystrobin(SC)and 20%penthiopyrad(SC)as the test drugs,and Xintai'Mici cucumber'as the test variety to conduct a pesticide control experiment on cucumber powdery mildew.The results showed that the four fungicides had the good control efficacy against the cucumber powdery mildem and had no bad effect.The 42.8%triflumizole-trifloxystrobin(SC)was the best fungicide to control the disease.The control efficacy were 83.92%and 75.25%after after 7 days and 14 days of spraying fungicide,there were significant difference among them.It was suggested to spray 2 or 3 times to control the disease and there was a 7 day interval between 2 times in the controlling process,at the same time 20%penthiopyrad(SC)was the alternative agent to use in order to avoid the drug-resistance of the pathogen.
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