Control Research of 4 Bactericides on Cucumber Downy Mildew

Control effect of 4 bactericides on cucumber downy mildew was studied.The results showed that 14 day after the second pesticide application,10% Yinfali 600 and 800 times had control efficacy of 86.05% and 84.77% on cucumber downy mildew,respectively,and 69% Ankemengxin 1 000 times and 72%Dubangkelu 600 times had control efficacy of 77.94% and 74.73%,as the control metalaxyl only 64.73%.It was suggested that Yinfali,Ankemengxin and Dubangkelu should be used alternately to reduce the drug resistance of downy mildew.