Recently, powdery mildew of bitter melon, scorpion and other vegetable crops has occurred heavily. Some farmers have been rushing to the hospital for medical treatment. The old formula of pesticides is introduced in the data. The treatment effect is very poor, which not only costs more, but also affects the yield of crops. In recent years, several special effects drugs for powdery mildew have been registered in China, and they are shared with everyone:
Bitter gourd powdery mildew is a fungal disease that occurs on the leaves, petioles and stems of plants. The lesions are generally on the front side, initially yellow spots, and later expanded into white powder spots, and then connected to the whole leaf surface, and finally the whole leaf is covered with white powder, and the color of the lesion becomes grayish white or gray, and black granules are formed. The top of the yellowing bunch is curled, the plant is declining, the young melon is deformed, the growth period is shortened, and the yield and quality are significantly reduced.
According to the China Pesticide Network , the important factors inducing powdery mildew are humidity and temperature. In the spring and autumn, when the temperature is between 16 ° C and 24 ° C, under the conditions of rainy and high humidity, the disease is most prone to prevalence. In high temperature and dry weather, it can inhibit the development of pathogenic bacteria, and this disease will occur slightly. In the dry season, if there is enough dew in the evening, the disease can still be seriously harmful. The pathogen has no obvious wintering period, usually warm and wet weather, excessive application of nitrogen fertilizer or insufficient fertilizer, and the plant grows too vigorously or has a bad onset.
The method to prevent and control powdery mildew: First, carry out rotation, do not mix with cucurbitaceae vegetables. Appropriate application of nitrogen fertilizer, if the nitrogen fertilizer is too much, the branches and leaves are lush and cloudy, the ventilation is high, and it is easy to develop. Secondly, it is necessary to reduce the humidity in the field. Pay attention to the drainage of the ditch in the rainy days to prevent waterlogging, and properly cut off the dense old leaves to make the ventilation and light transmission good.
In addition, it is necessary to apply chemical control in time: prevention: 10% fungicide Barton (diphenylcarbazole) 1500 times solution. Treatment: Foliar application of 25% pure pass (myrazole) emulsifiable concentrate 3000 times solution, 30% Shifei (flusilazole) 5000 times solution and 75% force (tridemorpholine) 3500 times solution Galodis silicone is used interchangeably, once every 5~7 days, even sprayed 3 times, the effect is excellent.
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