Study on Application of Nativo in Controlling to Cucumber Powdery Mildew

Taking 'Zhenghuang 3' cucumber as material,the effect of nativo on cucumber growth was studied by soaking seeds and spraying it on seedling respectively,while field trial was also conducted to evaluate the control efficacy of nativo to cucumber powdery mildew.The results showed that nativo had a good control effect on cucumber powdery mildew,while plant height,root length and increase rate of stem diameter were significant lower than that of hexaconazole after seed-soaking treatment.Rate of plant height inhibition were 15.62% and 4.65% at cucumber seedling and florescence period after spraying treatment with concentration of 60 mg/L,which were significantly lower than that of hexaconazole.The control efficacies were 73.82%~84.26% in field trial,which was as good as that of hexaconazole but was higher than that of topsin-M.The study showed that nativo was safe to cucumber and efficacious to powdery mildew.It can be used as an alternative chemical to control cucumber powdery mildew.