Dry heartburn
The dry Chinese cabbage heart is a common physiological disease in cabbage production. At the beginning of the disease, the top edge of cabbage leaves is curled outwards, the leaf margins gradually dry and yellow, the lesions spread, the leaf tissue is water-stained, and the upper part of the leaves is also Gradually dry and yellow, the leaves are dry paper. The diseased leaves were mainly concentrated in the middle of the leaf ball, and most of the leaves of the seriously diseased plants were dry and yellow. The onset of the field began in the rosette period. Some young leaves showed only dry edges, and only after the ball appeared, they showed symptoms. The storage period was severe. Therefore, adopting targeted management measures can improve the quality of Chinese cabbage and increase farmers' income.
Possible prevention and control measures: 1. Select disease-resistant varieties. 2, scientific and rational fertilization. Increase organic manure, control the amount of nitrogen fertilizer, improve soil properties, and promote robust growth of plants. 3, strengthen fertilizer and water management. During the growth period of Chinese cabbage, the water supply should be uniform. Before sowing, it should be irrigated with water. During the seedling stage, small water should be poured. During the rosette period and the ball stage, topdressing should be performed in stages to avoid concentrated fertilization. After irrigating, timely cultivating loose soil to prevent soil compaction. 4, pay attention to the choice of mouth. When planting Chinese cabbage, try to avoid connecting crops such as cabbage and tomato with high calcium requirements. 5, timely calcium supplementation. The calcium fertilizer can be sprayed on the leaf surface to promote the growth of Chinese cabbage, improve the quality, and control the occurrence of Chinese cabbage dry heart. During the rosette period of Chinese cabbage, every 7-10 days, the heart leaf is sprayed with 0.7% calcium chloride and 50ppm naphthylacetate mixture or 1% calcium superphosphate solution 50kg. Spray 3 to 5 times continuously.
White spot disease
Chinese cabbage white spot disease mainly damages the leaves and is one of the major diseases of cabbage leaves. At the beginning of the disease, small brownish-brown spots appeared on the leaves, which later expanded into round, near-circular, or oval lesions with pale yellow halos around the lesions. The outer edge of the lesion is dark green, but sometimes it is not obvious. The lesions were white at the end, translucent and roasted like fire. Sometimes the lesions break or fall off. In the late stages of the disease, they form into irregular, massive, dry dead spots. When the air is wet, gray molds often appear on the back of the lesion. Frequent downy mildew, and increase its harm.
Possible prevention and control measures: 1. Select disease-resistant varieties. 2, a reasonable rotation. More than 3 years of rotation are performed on heavier plots perennially. 3, do a good job of seed disinfection. It can be soaked in warm water at 50°C for 15 minutes and allowed to dry. It can also be used for sowing. It can also be used with 0.4% thiram. 4. Strengthen field management. Choose land plots with high topography and well-drained land. Application of organic fertilizer after maturity, increased phosphorus, potassium fertilizer, improve plant disease resistance, so that reduce the incidence. Drain the water after the rain and remove the diseased leaves in time. After the harvest, remove the field sickness and plunge the soil. 5, pharmaceutical control. Available 70% mancozeb WP 500 times. Or spray with 64% antivirus WP 600 times. Spraying once every 10 days or so, even spraying 2 or 3 times, the effect is better.
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