The main symptoms of Botrytis cinerea are the infestation of residual flowers and receptacles when the fruits are damaged, and they gradually spread to the fruits and stalks, causing the peels to turn gray and soft rot. After that, a large amount of earthy gray appears on the fruit surface and pedicel. Mold layer, fruit dehydration rigidity. The leaves are attacked. The lesions start from the tip of the leaf. The lesions develop inwards in a "V" shape. They are initially immersed in water, light brown, irregular in the edges, and there are dark and light ring veins. There is a small amount of gray mold on the surface. Finally, the leaves die. .
Control methods:
1. Reducing the humidity in the greenhouse: High-ridge cultivation, drip irrigation water supply, to avoid flood irrigation, watering is best carried out in the morning on sunny days, avoid watering in rainy days, can effectively reduce the indoor humidity. In addition, laying a layer of dry wheat straw in the furrow not only can release surface water, but also can ease the temperature change of the crop growth layer, reduce the condensation caused by the high humidity and large temperature difference, and has the effect of absorbing moisture.
2. Variable temperature ventilation: Temperatures above 31°C can slow down the germination rate and the number of botrytis spores. Therefore, they are selected to release air in the sunny hours of the morning and evening, so that the temperature of the greenhouse can rapidly rise to 33°C and then release the air. When the temperature in the greenhouse falls below 25°C, it will continue to release air at noon. In the afternoon, the temperature in the greenhouse shall be kept at 25-30°C. When the temperature in the greenhouse drops to 20°C, the air vents are closed to slow down the nighttime room temperature and keep the greenhouse temperature at night. 15 to 17°C. Rainy days should be promptly opened vent ventilation.
3. Removal of residual petal and stigma: The initial infestation site of Botrytis cinerea on the fruit is mainly residual petal and stigma, and then spreads to the pedicle and the umbilicus, and finally extends to other parts of the fruit. Therefore, the residual petal and stigma of Tomato fruit should be removed 7 to 15 days after tomato flowering (the young fruit diameter is about 1 cm). The specific method of operation is to pinch the handle of the tomato with the index finger and thumb of one hand, and remove the remaining petals and stigmas with a slight force.
4. The control method of the gray mold: 50% sclerotium net 1500 times, 40% Shijiale 1200 times, 2.5% Shilo 1500 times, 50% acetaminophen 1000 times, 70% Thiophanate-methyl wettable powder 800 times, 50% ethammacecan wettable powder 1500 times, etc., spraying 7-lOd once, even spray 3-4 times. Since gray mold is extremely susceptible to drug resistance, it must be noted that a pesticide cannot be used in conjunction and should be used interchangeably with a variety of pesticides.
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