Chinese cabbage white spot prevention and treatment
First, the onset of symptoms: Chinese cabbage leukoplakia mainly damage the leaves, when the disease leaf surface scattered many gray and white near-round lesions, the center has 1-2 irregular ring-shaped lines, the periphery has a pale 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 appear on the back of the lesion.
Second, control methods:
1, choose resistant varieties. Lubai 1, Qingyan 1, Beijing Xiaoza 56, Lubao, Lubai 6, etc.
2. Do a good job in seed treatment: Use 75% chlorothalonil or 50% thiram for WP, 0.3~0.4% of the seed weight; use 50% acetaminophen WP for seed dressing; 0.2?0.3% for seed weight.
3, to strengthen the cultivation and management: the implementation of serious wards and non-crucified vegetables for 2-3 years rotation. Level land, increase basal fertilizer, timely planting, prevent water accumulation in the field, remove stubborn leaves from the fields after harvest, and plough deep into the soil to reduce pathogens, cultivate strong strains, and reduce incidence.
4. Chemical control: When there is sporadic disease in the field, one of the following pesticides is selected: Spraying: 50% carbendazim WP 500 times, 40% carbendazim suspension 800 times, 75% thiophanate-methyl Wettable powder 800 times, 70% mancozeb WP 500 times. In the case of mildew and white spot disease, it can be mixed with carbendazim WP 300 times in carbendazim solution. Spray once every 10 days or so and spray 2 to 3 times.
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