A greenhouse experiment was carried out on cucumber cultivar DP-164 during the seasons 2012-2013 to evaluate the efficacy of three concentrations of fulvic acid (FA) to control downy and powdery mildew diseases compared with the... more
A greenhouse experiment was carried out on cucumber cultivar DP-164 during the seasons 2012-2013 to evaluate the efficacy of three concentrations of fulvic acid (FA) to control downy and powdery mildew diseases compared with the recommended fungicides and their effects on plant growth, chlorophyll content and yield of cucumber plants. Results revealed that all FA concentrations significantly reduced disease severity of both diseases. The highest reduction in disease severity of downy mildew was recorded using 75 ppm of FA, which was more effective than the recommended fungicide. The significant effect of inhibition of powdery mildew diseases increased gradually with increased FA concentration. At the same time, the reduction of diseases severity was greater than or equal to the recommended fungicides. Foliar application of FA concentrations and Ridomil fungicide increased significantly all morphological characters. Sumi-8 fungicide increased the morphological characters except plant...
