In the recent Chinese cabbage, there are yellow leaves, and the yellow side is accompanied by wilting symptoms. This is caused by the mustard Brassica plantarum, which incurs diseases such as Chinese cabbage, cabbage, kale, broccoli and other cruciferous vegetables. If it is called Chinese cabbage cabbage disease, it is called incidence in cabbage. Yellow leaf disease for cabbage. The pathogenesis of these two diseases is the same. Pathogens survive in the soil. Soil temperature is too high in the year of drought, resulting in burning of the roots. The roots are gradually corked, causing the invasion of pathogens and causing morbidity.
Chinese cabbage yellow leaf disease begins to appear at the seedling stage and is characterized by slow growth. Half of the leaves turn green and cause half-plant or whole leaf wilting. The primary root vascular bundle becomes brown. The leaves begin to yellow during the period from rosette to early filling. Into the middle of the middle of the package, the veins faded and turned yellow. Veins and veins remained dark green around them. The leaf margins were dehydrated, shrunk, and curled inwards, causing the plants to appear atrophic or withered.
First of all, agricultural control: (1) selection of varieties resistant to yellow leaves; (2) sowing time should not be too early to avoid high temperature and dry season; (3) 50% DT (copper fertilizer copper acid) 250～ 300 times liquid soaking for 30 minutes; (4) high ridge colonization, ridge height of 20 ~ 25 cm, promote root growth and development, but also help increase soil temperature difference between day and night; (5) pouring water, reduce ground temperature. Secondly, drug control can be used 50% carbendazim suspension 500 times, 50% thiophanate-methyl WP 500 times, 12.5% ​​synergistic carbendazim Solvent 300 times solvent spray root treatment.
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