Effect of Propamocarb Hydrochloride + Fosetyl Aluminum in Control of Cucumber Damping-off Disease in Field and Greenhouse

Efficacy of propamocarb hydrochloride + fosetyl aluminum (Previcur® Energy SL 840) in controlling of cucumber damping-off (Phytophthora drechsleri) was studied in comparison with metalaxyl (Ridomil® G 5%) under field and greenhouse conditions. Trials were done at CRBD during two years by three methods as soil drench, soil incorporation and their combination. The results of the field and greenhouse trials showed that there were significant differences between treatments. Combined mean comparison of two years in micro plot trials revealed that Previcur Energy at 2 and 3 ml/m2 rates had the same effects in disease control so that it decreased the disease by the 78% compared to the control. In this trial Ridomil at the rate of 2.5 g/m2 decreased the disease by the 68.4% compared to the control. The results of the greenhouse trials showed that there was no significant difference between Previcur Energy at the rates of 200, 300 and 400 ml/m3 of soil and 0.2, 0.3 and 0.4% in all application methods at the statistical level of 5 and 1%. These results revealed that Previcur Energy at applied rates decreased disease by the 66.6 to 91.26% compared to the control. However Ridomil 250 g/m3 and 0.25% decreased the disease rate by 45.74 to 63.52% compared to the control. Comparison of the effects of treatments in controlling disease through the different application methods demonstrated that two time application of Previcur Energy and Ridomil as soil incorporation at pre-sowing and soil drench at the two leaf stage had the best effects.