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Most of the gray mold bacteria invade from the flower after opening, causing the flower to rot and produce gray mold. Gradually spread to the young melon, the top of the melon strip is chlorotic and watery, softened and atrophied, and finally rotted. Sometimes black sclerotia grows on the melon. The bacteria overwinter on the soil or sick bodies with sclerotia or conidia. In the second year, conidia spread by airflow. It can occur at 4-22 degrees Celsius, but the suitable temperature is 17-20 degrees Celsius, and the relative humidity of the air is more than 93%.
The following measures are mainly taken to prevent gray mold: 1 cultivate disease-free and strong seedlings. First, 2-3 weeks before planting, 40 ml of formalin and 2-4 kg of water per square meter of bed soil were poured on the bed soil, and the film was disinfected for 4-5 days. Second, 65% of the moldy spirit was used before planting. Wet powder (hereinafter referred to as mefen) or 50% procymidone WP (Speed ​​Keling) 1000 times liquid spray seedlings, seedlings transplanted with drugs, high ridge or half-high ridge cultivation, and cover the mulch; Watering should be done on a sunny morning. Spray water on the mold before the water, or spray the shed, so that the temperature is 35-38 degrees Celsius, and the air is drained after 1 hour. 2 Clean the field, promptly remove the flowers, diseased fruits, and diseased leaves in the field, and take them out to be buried or burned outdoors. 3 scientific release, closed in the morning to raise the temperature to 32-40 degrees Celsius, at noon and afternoon, the temperature is reduced to 20-25 degrees Celsius, the humidity is 70%-80%, and the wind is released for 2-3 hours in the evening, then the shed is closed to keep the temperature At 12-13 degrees Celsius. If the outside temperature is above 14 degrees Celsius, it can be dehumidified at night. 4 Chemical control, spray the flowers, young melons and leaves with Methylformin or Suclon 1000 times after 4 days of application. Spray once every 7 days and spray 4-5 times.
Control measures of western squash gray mold in protected area
Botrytis cinerea is a common disease in the protection of zucchini, mainly harmful to zucchini flowers, leaves, stems and young melons. The severity of the disease is closely related to the level of producer management. If management is good, it will not happen. If the management is not good, the production will be reduced by 10%, and the heavy ones will be reduced by more than 30%.
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