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In summer, eggplant is prone to epidemic of M. blight in hot and rainy conditions, and there is a lot of rotten fruit. We must take timely measures to prevent and cure it. First, strengthen the cultivation and management. Choose a high-dry, well-drained fertile soil to grow eggplant. Rigging and planting, when the rainy season is approaching, clean up the ditch, drain it immediately after the rain, and lightly feed the well water to prevent heat and rain damage. Apply base fertilizer, apply fertilizer in a timely manner, increase phosphorus and potash fertilizer, and avoid partial application of nitrogen fertilizer. Properly dense planting, appropriate removal of the old leaves at the bottom, improve the ventilation and light transmission conditions between the rows. The diseased leaves and diseased fruits are removed timely and concentrated or burned to reduce the re-infection of pathogenic bacteria. Second, pharmaceutical protection. Spraying before onset or early onset of the disease, focusing on the protection of the plant's lower part of the eggplant, and pay attention to spraying the ground, the rainy season but also sprayed to protect the twigs. Pharmacy can be used 75% chlorothalonil WP 600 times, 64% WP 500 times, 65% dexamethasone WP 500 times, 72.2% Proclex 800 times, 1:1 : 200 Bordeaux Liquid, alternating use alternately, 7 to 10 days 1 time, even spray 3 to 4 times, have good control effect.