1. Downy mildew: the seedling stage is susceptible to disease (at the moment it is the seedling stage), especially when it encounters continuous high temperature and drought during 7-8 leaves. When the amount of aphids is large, it spreads quickly and the disease is heavy, showing a distorted mosaic. And shrink, deformed, dwarf, and accompanied by necrotic spots. In the early stage of disease, foliar spray of 40% ADP 800 times solution, 58% metalaxyl MnZn 500 times solution, 64% antiviral 500 times solution, 75% chlorothalonil 500 times solution can be used; Manganese zinc or 72% DuPont Kelu 800 times foliar spray, once a week, sprayed 2-3 times.
2. Viral disease: In the hair-blowing period or during the cooling period, the temperature is hot and cold, or in case of rainy weather, the disease is heavy. It mainly infects the leaves, and the water-soaked, unclear chlorotic spots are formed on the edge of the leaves. The back of the leaf produces a sparse layer of white mold, and the final leaves turn brownish and dry. At the beginning of the disease, 20% of the virus is sprayed at A400 times, 7 days apart, and even sprayed 3 times, or sprayed with 1.5% of diseased Ling-Emulsion 400-500 times, sprayed twice a day, and sprayed for 7-10 days. Second, it can effectively prevent viral diseases.
3. Soft Rot Disease: It is prone to occur in the middle and late stages. The diseased area first starts from the base. The lesions are mostly watery and yellowish. The symptoms are not obvious at the beginning. Afterwards, the leaves fall down during the day, and sooner or later the erection is restored. After a few days, the diseased leaves Gradually flat on the ground or dehydration dry thin paper-like close to the solid. In severe cases, the roots are festered, mucus overflows, and foul odors are emitted. At the beginning of the disease, it was sprayed with 3000 times of streptomycin for agricultural use or 4000 times for neophytin, and sprayed once every 10 days for continuous prevention and treatment 2-3 times. 72% agricultural streptomycin 3000-4000 times solution or neophytin 4000 times solution can also be used to irrigate the roots. Severe diseased plants were found to be removed in time and a layer of quicklime was sprinkled in the root soil to prevent infection when watered. It can also be sprayed 3-4 times with potassium permanganate 600-800 times from the seedling stage of Chinese cabbage to the rosette stage, which can effectively prevent soft rot and simultaneously treat downy mildew of Chinese cabbage.
4. Bacterial speckle disease: round lesions, diameter 2-6 mm, brown or dark brown, there are obvious concentric ring patterns on the surface of the plaque, black mold layer above the wet lesions, when the disease is severe, the lesions are connected One piece, so that the entire blade died. Temperature 13 °C -15 °C, high humidity and rain, too much dew, sowing too early, lack of fertilizer and water, extensive management, are likely to cause the disease. Including bacterial angular spot and bacterial black spot. 72% agricultural streptomycin soluble powder 3000-4000 times, neo-mycin soluble powder 4000 times spray, 50% profitable wettable powder 800-1000 times, 70% mancozeb wettable powder 500 times liquid, 58% methosulfuron WP wettable powder 500 times, etc., alternating use.
5. Black rot: The diseased plants were mostly "V"-shaped lesions on the leaf margins and gradually expanded inwards. The tissues around the lesions turned yellow and the leaves were dry when heavy. Bad rotten heart, black vascularity of the roots of the vegetable gang. Insects and agricultural activities can spread the disease. High humidity, too much dew, etc. are the conditions that induce this disease. At the beginning of the disease, 75% chlorothalonil WP can be sprayed 600-800 times, or neophytin 4000 times, 50% metalaxyl copper sulphonate wettable powder.
6. Locusts: The spray can be controlled by 10% imidacloprid wettable powder 1000-2000 times liquid, 50% anti-inflavor wettable powder 4000-8000 times liquid.
7. Yellow striped jumper: Use 90% trichlorfon 1000 times solution or 50% phoxim EC 1000 times foliar spray or root control.
8. Pieris rapae, Plutella xylostella, and rapeseed meal: 5% chlorfluazuron EC 2500-fold or 2.5% enemies can kill 800-fold sprays, using 50 kg per mu.
9. Spodoptera litura: spray control should be mastered in the 1-2 instar larvae, spraying time in the morning and evening, the amount of spray water should be enough, the plant base and the ground must be sprayed, and the drug should be used in rotation. Control agents can be used 90% trichlorfon 800-1000 times, or 50% phoxim EC 1000-2000 times sprayed 2-3 times, every 7-10 days.
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