Study on the Effect of Iminoctadine Tris and Sulphur in the Control of Cucumber Powdery Mildew Disease (Golovinomyces cichoracearum) in Field Cultures

Subject Areas : Plant Protection

Hossein Azimi ¹

1 -

Received: 2014-11-10 Accepted : 2015-05-24 Published : 2014-11-22

Keywords:

Abstract :

Efficacy of Iminoctadine Tris (Belkute® WP 40%) and Sulphur (Sulfolac® WG 80%) in controlling of cucumber powdery mildew disease agent (Golovinomyces cichoracearum) was studied at 2011-2012 in Karaj under field conditions. Treatments included different doses of Belkute and Sulfolac as the target and Karatane (Dinocap® EC 35%) and Sulphur (Thiovit® WG 80%) as the reference fungicides along with the no spraying control. Trials were done at Complete Randomized Design with 9 treatments and 4 replications. For each plot 10 supposed areas (50×50 Cm) selected randomly and labeled. Foliar application of fungicides were made at the onset of the early symptoms in the treated plots and followed until control plots got high infection at 5, 7, 10 and 14 days intervals. Assessment of the effects of treatments in terms of decreasing disease severity index (DSI) assigned by foliage protection percentage (FPP) was performed using modified Horsfall and Barrat method by giving 1-7 marks, before each spraying. The two final assessing was done with 14 days intervals after the last spraying. Area under the disease progress curve (AUDPC) and efficacy of treatments calculated compared to control using five separate disease assessments data. Analysis of variance done in Randomized Complete Blocks Design (RCBD) for each assessments, AUDPC and efficacy by SAS software, and means were compared with Duncan multiple range tests. The results of analysis of variance revealed that there were significant differences among treatments in DSI in all assessments, AUDPC and efficacy (P<0.05 and P<0.01) for two years. Comparison of the means showed that Belkute 0.75 and 1 kg/ha had the best effects in disease control and decreased disease as 89.46% and 90.74% compared to control respectively.

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