Chinese cabbage is one of the main vegetable varieties in autumn, but there are many types of pests and diseases in autumn. Chinese cabbage dried heart and Chinese cabbage white spot disease are common diseases in the production of Chinese cabbage. The occurrence of diseases seriously affects the yield and quality of Chinese cabbage. It is very important to do a good job of pre-planting and post-emergence management of Chinese cabbage to reduce pests and diseases. So how do Chinese cabbages fight disease in the fall? Here is a small series of Huinong. I will introduce the prevention and control methods of Chinese cabbage in autumn.
First, Chinese cabbage dry heart
Chinese cabbage dry heart is a common physiological disease in cabbage production. At the beginning of the disease, the top edge of the leaf is turned outward, the leaf edge gradually becomes yellow and yellow, the lesions continue to expand and the leaf tissue is water-stained. It is in the form of a dry paper and the upper part of the blade is gradually dried and yellowed. Adopting targeted management measures can improve the quality of Chinese cabbage and effectively increase farmers' income.
Prevention:
1. Choose resistant varieties.
2. Scientific and rational fertilization. Add organic fertilizer and control the amount of nitrogen fertilizer, and improve soil traits to promote robust growth of plants.
3. Strengthen fertilizer and water management. The watering period of Chinese cabbage should be evenly watered, water should be poured before sowing, and the water should be poured in the seedling stage. In the rosette stage and the ball-forming stage, the fertilizer should be applied in several stages to avoid concentrated fertilization. After pouring water, it is necessary to cultivate the loose soil in time to prevent soil compaction.
4. Pay attention to the choice of mouthwash. When planting Chinese cabbage, try to avoid cropping with crops such as cabbage and tomato that require a large amount of calcium.
5. Timely supplement calcium nutrition. Foliar application of calcium fertilizer can promote the growth of Chinese cabbage, improve the quality, and control the occurrence of dried cabbage in Chinese cabbage. When the Chinese cabbage enters the rosette period, every 7 to 10 days, spray a mixture of 0.7% calcium chloride and 50 ppm naphthalene acetic acid or 1% calcium superphosphate on the heart leaf for 50 kg, and spray 3 times to 5 times continuously.
Second, Chinese cabbage white spot disease
Chinese cabbage white spot disease mainly harms leaves and is one of the main diseases of Chinese cabbage leaves. In the early stage of the disease, small spots of taupe were produced on the leaves, which later expanded into round, nearly round or oval lesions with a pale yellow halo at the edge of the lesion. The outer edge of the leaf back lesion is dark green, but sometimes it is not obvious. The lesions are finally white or translucent, just like being grilled by fire, sometimes the lesions rupture or fall off. In the late stage of the disease, the lesions are connected into irregular large dead spots. Gray mildew often occurs on the back of the lesion when the air is wet, often accompanied by downy mildew, which increases its harmfulness.
Prevention:
1. Choose resistant varieties.
2. Reasonable rotation. Perennial onset of heavy plots for more than three years of rotation.
3. Do a good job of seed disinfection. It can be soaked in warm water at 50 °C for 15 minutes, cooled and dried, and then sown. It can also be mixed with 0.4% thiram.
4. Strengthen field management. Choose plots with high ground and well drained land. Applying the organic fertilizer after decomposing, adding phosphorus and potassium fertilizers, improving the disease resistance of the plants and reducing the incidence. After the rain, drain and remove the diseased leaves and dead leaves in time, remove the diseased residues in the field and deepen the soil after harvesting.
5. Chemical control. Spray 70% mancozeb wettable powder 500 times solution, or use 64% anti-virus WP WP 600 times solution, spray once every 10 days, even spray 2~3 times better.
The above is the knowledge about how to prevent and cure the disease of Chinese cabbage in the autumn of Hui Nong. I hope to help the farmers.
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