Yield Loss Assessment and Determination of Control Thresholds for Powdery Mildew of Eggplant (Solanum melongena)

This study was carried out to develop the economic thresholds for powdery mildew on eggplant. To investigate the relationship between powdery mildew incidence degree and yield, experimental plots with ten treatments as the initial disease degree were established. Disease severity exhibited negative and significant correlation with fruit weight and number of fruit. There existed close correlation between rate of diseased leaf area and yields in the greenhouse (control with fungicide Y = -36.5X+2938.5 R 2 = 0.91 r = -0.913 * , no fungicide: Y = -29.57X+2574.4 R 2 = 0.73 r = -0.858 * ). There existed close correlation between rate of diseased leaf area and yield loss in the greenhouse (Y = 1.27X-2.4 R 2 = 0.88 r = 0.91 * ). The economic thresholds for powdery mildew on eggplant was below 14.7% rate of diseased leaf area per plant in the greenhouse.

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