Seven Kinds Of Fungicides For Controlling Cucumber Downy Mildew Of Efficacy Test

Cucumber downy mildew by Pseudoperonospora Cubensis caused is a serious disease onthe production of cucumber. It occurred widely in any planting cucumber place are likely tooccur and has great effect on Cucumber production. Cucumber is an important economic crop.Due to environmental conditions, cucumber downy mildew occurs almost every year in DaliCounty Weinan City can caused great losses to local farmers. In order to provide bettermethods of controlling downy mildew of cucumber, we select seven chemicals sales point,summed up the main agent72.2%Propamocarb AS,72%Cymoxanil Mancozeb WP;80%Mancozeb WP;80%Dimethomorph WDG;250g/L Azoxystrobin SC;70%Propineb WP;47%Kasugamycin Copperoxychloride WP is the area of the control of cucumber downymildew, and the efficacy of the7agents do for efficiency test. The main result we obtained asfollows:1.These agents have anti effect of cucumber downy mildew disease, of which72.2%ofPropamocarb AS (800times，90.25g/667m2) and250g/L Azoxystrobin SC (1000times,25g/667m2) of two fungicides against cucumber downy mildew preventive effect wassignificantly higher than that of other chemicals. And80%Mancozeb WP(600times,133.33g/667m2) and80%Dimethomorph WDG (1000times,80g/667m2) was significantlylower than that of several other chemical control effect, control effect is lower than70%.2.The control of Cucumber Downy Mildew of72.2%Propamocarb AS (800times90.25g/667m2),250g/L Azoxystrobin SC (1000times,25g/667m2) two agents as the mainagent, used interchangeably during use, lest pathogenic bacteria develop resistance, the agentfailure.72%Cymoxanil Mancozeb WP (800times,90.00g/667m2),70%Propineb WP (500times,140g/667m2),47%Kasugamycin Copperoxychloride WP(800times,58.75g/667m2) ofthese three agents can be used cooperate with the two kinds of main agents, and80%Mancozeb WP (600times,133.33g/667m2) and80%Dimethomorph WDG (1000times,80g/667m2) recommended a moratorium on the use of. In the early stage of cucumber downymildew disease suggest spraying prove spray pesticides, then spraying every7days time, atotal of3times, the above basic control effect reached80%, can harm the very good controlof cucumber downy mildew.