Control Effect of Vegetable Oil on Cucumber Powdery Mildew

[Objective] The study discussed the indoor activity and field control effect of vegetable oil on cucumber powdery mildew.[Method] The cucumber seedlings of Changchunmici were adopted as the material,which were inoculated with the fungus pathogen of cucumber powdery mildew naturally occurred in the field.The indoor protective test and field test were performed respectively to observe the control effects of different plant oils EC on the cucumber powdery mildew.[Result] When six plant oils EC including cottonseed oil,soybean oil,canola oil,corn oil,sesame oil and sunflower oil was diluted into 10 and 5 ml/L,they had better control effect on cucumber powdery mildew.As for the indoor protective effect,the protective effect of the vegetable oil EC was equivalent to the control agent triadimefon EC,the field control effect of vegetable oil EC was in the range of 60%-75%,which was consistent with 69%-70% control effect of contrast agent with 1 ml/L triadimefon EC dilution.[Conclusion] All vegetable oils EC had significant control effect on cucumber powdery mildew in the test.

Application of Nativo in Control against Cucumber Powdery Mildew

[Objective]The paper was to explore application of nativo in control against cucumber powdery mildew.[Method]Taking ＂Zhenghuang 3＂ cucumber as the material,the effects of nativo on growth of cucumber at different periods were studied by soaking seeds and spraying treatment on stems and leaves.The field efficacy trial against powdery mildew was also carried out to comprehensively evaluate control effect of nativo against powdery mildew.[Result]Seed soaking by nativo had good preventive effect on powdery mildew,while plant height,root length and increase rate of stem diameter were significantly lower than that of hexaconazole.Rates of plant height inhibition were 15.62% and 4.65% at seedling and flowering stage after spraying 60mg/L of nativo,respectively, which were significantly lower than that of hexaconazole.The control efficacies of nativo were 73.82%-84.26% in field trial,which was as good as that of hexaconazole but higher than that of Topsin-M.[Conclusion]Nativo is safe to growth of cucumber,with good control effect on powdery mildew.It can be used as an alternative fungicide to control cucumber powdery.