Before and after the beginning of autumn, it is the sowing period of Chinese cabbage in North China, but the diseases of soft rot, dry heartburn, downy mildew and black spot disease affect the yield and quality of Chinese cabbage every year, which is a big worry for farmers.
Most farmers spray only when they find a diseased plant. The result is often unsatisfactory. You can take a week to get a medicine for up to a week, or the disease will continue. In this way, farmers in a growing season should spray once a week, at least three times, and time-consuming and costly, resulting in higher drug residues. In fact, comprehensive prevention and treatment is the best prevention and treatment program.
Choose the varieties with good resistance and good quality, and try to choose the cannon-type Chinese cabbage variety represented by Beijing New No. 3 with strong disease resistance and good quality.
Plot selection and ridge cultivation of Chinese cabbage are not drought-tolerant or resistant to phlegm, and high-humidity environment is very beneficial to soft rot, downy mildew and black spot. Should choose the sandy loam soil, drainage and watering convenient plots, ridge cultivation can significantly reduce the occurrence of diseases.
Balanced fertilization is very important. Chinese cabbage also likes potassium. Apply about 100 kg of potassium sulphate-type NPK fertilizer per mu to the base fertilizer, and apply high-quality potassium nitrate during the rosette period. Both nitrogen and potassium can be added. 30 kg of urea and 20 kg of potassium sulphate can be applied per mu. Apply organic fertilizer as much as possible, but it must be fully decomposed organic fertilizer.
Properly planting the wrong development period, delaying the sowing period properly, avoiding the period of high temperature, high humidity and easy onset of the rosette period, can significantly reduce the occurrence of diseases. Early-maturing varieties should be postponed for about one week after the fall, and the mid-maturing varieties can be postponed until three days after the autumn, and the late-maturing varieties are planted on the autumn day.
Seed treatment to reduce the amount of bacteria before planting with 3% carbendazim wettable powder 1% seed dressing by seed weight, or 40% more · Fu · bromine wettable powder, seed dressing 0.3% by weight of the seed.
Spraying in advance to prevent disease, cabbage, and seedlings are sprayed three times in a row, once every 7 days. The medicament can be used to prevent bacterial diseases such as soft rot and black rot, such as agricultural streptomycin, neutrophin and 30% succinic acid copper suspension.
After the disease is sprayed and the diseased plant is found to have a soft rot disease plant, the diseased plant is first removed and taken out of the field for deep burial, and immediately sprayed. For downy mildew, 72% cream urea manganese zinc wettable powder, dimethomorph and other agents can be used. For fungal diseases such as black spot and anthracnose, difenoconazole, myclobutanil and other agents can be used. For heartburn, spray the calcium-containing foliar fertilizer with zinc-iron-boron multi-micro-fertilizer and spray twice.
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