Caixin is a widely used vegetable in the Jiangnan area of ​​China. In northern China, the production area is small and the consumption is small, which is a rare vegetable. Black spot disease is a common disease in the process of growing cabbage. Here is a brief introduction to black spot disease.
Black spot of cabbage is mainly harmful to leaves and petioles, and in severe cases, it is harmful to pedicels. The leaves are infected, the primary near-circular chlorotic plaques, the enlarged edges are light green to dark brown, and sometimes the lesions have a yellow halo, and the lesions have more obvious concentric rings. When the air is wet, the lower diseased leaves can be perforated. In severe cases, multiple lesions merge into large spots, causing the leaves or whole leaves to die, and finally the leaves of the whole plant are dried from the outside to the inside.
Black spot is common. Planting in open fields and protected areas is sporadic, and there is no significant impact on yield. The protected area is slightly heavier in spring and autumn. The general incidence rate is 10%-40%. Individual sheds, rooms and seriously ill plots are 100% ill, which has a significant impact on production. It is estimated that the damage can be 10%-30%, the most important. More than 50%.
First, seed treatment. The seed can be soaked in 50 ° C warm water for 25 minutes at a constant temperature, cooled and dried, and then seeded, or seeded with 50% of the weight of the seed of the seaweed WP or 50% of the carbendazim WP.
Second, chemical control. In the early stage of the disease, spray 75% chlorothalonil WP 600 times solution, or 70% mancozeb WP 500 times solution, or 47% 瑞瑞农湿湿 800 times solution, or 50% carbendazim wettability Powder 500 times solution, or 65% more fruit WP 1000 times solution, or 5096 WP 8.0 times solution, or 5096 Nongli Ling WP 1500 times solution, spray. 1 to 15 days of prevention and treatment, according to the condition of the enemy to prevent 1-3 times. Commonly used pharmaceutics, such as chlorhexidine, carbendazim, chlorothalonil, mancozeb, garinong, Duoguoding, Liede, and Nongling.
Third, according to local conditions, breeding and planting disease-resistant varieties.
Fourth, the use of sorghum planting, reasonable close planting, scientific fertilizer, cultivate strong seedlings; the diseased plants found in the field in time to remove the diseased residues in the field, reducing the source of bacteria in the coming year.
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