Investigation on the Efficacy of mefenoxam + azoxystrobin (Uniform SE 44.6%) in the Control of Cucumber Damping-off Disease Caused by Phytophthora melonis

To investigate the efficacy of azoxystrobin+mefenoxam (Uniform 44.6%), in the control cucumber damping-off disease, experiments were carried out with seven treatments and four replicates in a Randomized Complete Block Design (RCBD) in Tehran, Alborz and Semnan provinces. Treatments were included 0.75, 1, 1.25 and 1.5 ml L-1 rates of Uniform, ridomil+mancozeb (Rosalaxil WP 72%) 2 g L-1 along with inoculated and non-inoculated controls. Treatments were performed two times as soil drench system, first after seed sprouting and second after 2nd leaves stage. The results are reported as disease incidence percent when the plants were in 4th leaves stage. ANOVA and mean comparisons with Duncan Multiple Tests were performed using SAS software. However, combined analysis of variance revealed that there was significant difference in treatment×place interaction at 1% probability but due to the similarity in mean statistical grouping of separate and combined analysis, combined ANOVA means grouping was used for the results assessment. Results revealed that Uniform at the rates of 0.75, 1, 1.25 and 1.5 ml L-1 decreased the disease incidence by 69.95%, 76.82%, 76.45% and 87.01% compared with the inoculated control and located in the b, c, c, and d statistical groups respectively. Furthermore, the results revealed that the Rosalaxil 2 g L-1 as a reference fungicide decreased disease incidence up to 86.03% in comparison with the inoculated control. The results of this study reveal that the Uniform application at the rate of 1.5 ml L-1 could be recommended to be used to control damping-off disease of cucurbits.