Efficacy of Cyazofamid and Pyraclostrobin+ Dimethomorph Fungicides in the Control of Cucumber Downy Mildew
2020
Fani, Syed reza | Azimi, Hossein | Bigi, Farid
Abstract Downy mildew is the most important disease of cucumber. Efficacy of the fungicides Cyazofamid (Regnant® SC 20%) and Pyraclostrobin + Dimethomorph (Pyradim® DF 18.7%), in controlling cucumber downy mildew disease were assessed in Tehran and Mazandaran provinces in a Randomized Complete Block Design (RCBD) with 10 treatments and four replications. Treatments included the Regnant fungicide at three concentrations of 0.5, 0.6 and 0.75 ml/L and the Pyradim fungicide at three concentrationse of 0.25, 0.3 and 0.35 ml/L as target fungicides and Propamocarb hydrochloride + Fluopicolide (Infinito® SC 68.75%) 2ml/L and Cyazofamid (Ranman® SC 400) 0.5 ml/L as standard fungicides including two controls as with and without water spray. The combined Analyses of Variance (ANOVA) revealed a significant diference between treatments at level of 1%, but no significant difference was detected between locations and treatment × location intractions. Means comparison based on Duncan Multiple Range Test revealed that the Ranman® and Infinito® fungicides together with the Regnant at the dose of 0.75 ml/L decreased disease severity by 79.1, 72.8 and 71.9% compared to water spray treatment (control), respectively. On the contrary, the fungicides Regnant at the dose of 0.5 ml/L and Pyradim at the concentrations of 0.25 and 0.3 ml/L decreased disease severity by 46.7, 46.7 and 43.2% showing the lowest efficacy compared to water spray treatment (control), respectively.. Based on the results, the concentrations 0.6 and 0.75 ml/L of the Regnant and the dose of 0.35 ml/L of the Pyradim fungicides are recommended as the proper concentrations for control of the disease with 7-10 days intervals.
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