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First, soft rot. Commonly known as "rotten". At the beginning of the disease, the base of the cabbage helps to form a water-immersed yellowish infiltrating area, which gradually turns into a yellow-brown color, which is sticky and smooth, with leaves wilting, and finally causes the roots to rot and have a foul smell. Generally, it occurs from the rosette period to the core period. The disease is caused by soft rot bacteria. When the temperature and humidity are high, the bacteria multiply quickly and the occurrence is serious. Control method: sorghum cultivation, maintain good drainage in the field, smooth ventilation; timely sowing to prevent premature aging; implement long ridge and short irrigation, timely drainage after rain, remove diseased plants before irrigation, to reduce the spread of pathogens. In the early stage of the disease, agricultural streptomycin 150--200 mg / kg, or neo-phytomycin 200 mg / kg solution can be used, focusing on spraying the diseased plant and its surrounding petiole, and trying to make the liquid into the cabbage, generally 7-10 Spray once a day, even spray 2 - 3 times.
Second, downy mildew. Symptoms are polygonal or irregularly shaped lesions in the leaves. The veins are yellow-brown lesions. In severe cases, the lesions are contiguous, the leaves die, and the disease occurs after the rosette. The disease is a fungal disease, and spores are often spread by means of wind and rain. Therefore, warm and humid climatic conditions are conducive to the occurrence of the disease. Control methods: mainly based on agricultural control, supplemented by chemical control. In the early stage of the disease, spray 25% of the metalaxyl WP 800 times solution, or 75% of the chlorothalonil WP, or 40% of the Ethylene Phosphate WP 200-300 times.
Third, the virus disease. Also known as "cough disease." When cabbage is infested, the leaves appear bright veins and mosaic shrinkage, distortion, necrotic spots, streaks, and plants exhibit short streak deformities. The cabbage can be susceptible from the seedling stage to the core stage. It is mainly spread and spread by aphids as a medium for transmission. Control method: Under the premise of selecting disease-resistant varieties and timely sowing to ensure that the Chinese cabbage has sufficient growth period, in the drought and rainy years, pay attention to watering during the seedling period to reduce the soil temperature and preserve the seedlings. In the rosette period, it is necessary to lightly seedlings or not seedlings. In the early stage of the disease, spray 20% of virus A wettable powder 500 times solution, or 15% phytopathogenic emulsion 1000 liquid, spray once every 10 days, continuously spray 2 - 3 times. At the same time, it is possible to use a chemical such as imidacloprid, chlorpyrifos, and chlorpyrifos to control aphids in time and eliminate the vector.
Prevention and cure method of three major diseases of Chinese cabbage
Control methods for three major diseases of Chinese cabbage, Chinese cabbage, soft rot, downy mildew, and viral diseases, which are called the three major diseases in the production of Chinese cabbage, have a great impact on the yield of Chinese cabbage. When the disease occurs, the yield is reduced by 20%. %, the weight is above 50%. Therefore, it is very important to do a good job of prevention and control. Below, we will introduce the prevention and treatment methods of the three major diseases:
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