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Chinese cabbage white spot prevention and treatment
White spot disease seriously harms cruciferous vegetables, which not only causes loss of yield but also affects the quality and storage of vegetables. Mainly invaded cabbage, cabbage, rapeseed, turnip, radish, celery, and sesame, among which cabbage was more severe. The disease is often complicated by downy mildew, increasing its harmfulness. Symptoms: The main damage to the leaves, the incidence of leaf surface scattered long gray and white near-round lesions, the center has 1 to 2 irregular-shaped ring pattern, peripheral light yellow halo. 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. Control methods First, the selection of disease-resistant varieties: such as Beijing Xiaoqingkou, Daqingkou, Liaobai No. 1, sparse heart Qingbaikou and Yuqing and other varieties more resistant. 2. Do a good job in seed treatment: Use 75% chlorothalonil or 50% thiram for WP, the amount of which is 0.4% of the seed weight; use 50% acetaminophen WP for seed dressing, and the dosage is 0.2% to 0.3% of seed weight. Third, to strengthen the cultivation and management: the implementation of serious wards and non-cruciferous vegetables 2 to 3 years of rotation. Leveling the land, adding basal fertilizer, appropriate sowing to prevent the accumulation of water in the field, clearing the leftover leaves of the field after harvest, and ploughing and burying it in the soil can reduce germs, cultivate strong strains, and reduce the incidence. Fourth, the implementation of chemical control: When there is sporadic disease in the field, choose one of the following pesticides to start spraying: 50% carbendazim WP 500 times, 400% carbendazim suspension 800 times, 75% methyl Topozin WP 800 times, 70% Mancozeb WP 500 times. In the event of downy mildew and white spot disease occur in the same period, can be mixed in the carbendazim solution of 40% aluminum phosphate aluminum wettable powder 300 times. Spray once every 10 days or so, spray 2 or 3 times.
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