Investigation on the Efficacy of iminoctadine tris (WP 40%) in the Control of Cucumber Powdery Mildew Disease, Golovinomyces cichoracearum (DC.) V.P. Heluta

Efficacy of iminoctadine tris (Bellkute® WP 40%) in controlling of cucumber powdery mildew disease agent (Golovinomyces cichoracearum) was studied during 2011-2012 in Karaj under field conditions. The experiment was performed in a Randomized Complete Block Design (RCBD) with 6 treatments and 4 replications including Bellkute 0.5, 0.75 and 1 kg/ha as the target fungicide, karatane (Dinocap® EC 35%) 2 l/ha and sulphur (Thiovit® WG 80%) 3 kg/ha as the reference fungicides along with control without fungicide spraying. For each plot 10 randomly selected areas (50×50 cm) were labeled. Foliar application of fungicides were made at the onset of the early symptoms in the treated plots and followed until the control plots showed maximum infection in Horsfall and Barratt scale with 5, 7, 10 and 14 days intervals. Effects of treatments in terms of decreasing disease severity index (DSI) was assessed by foliage protection percentage (FPP) usingmodified Horsfall and Barratt method by assigning 1-7 scores, before each spraying. Area under the disease progress curve (AUDPC) and efficacy of treatments were calculated. The analysis of variance in Randomized Complete Block Design by SAS software revealed that there were significant differences among treatments in DSI (P