First, symptom recognition
Mainly harmful to the leaves. In the early stage of the disease, the leaves are white and mildewed, and the lesions are nearly circular to irregular. When the mold spots are mixed for a long time, they are covered with leaf backs, and the mildew spots turn brown to dark green. Oval or irregular yellowish chlorotic spots appear on the front of the damaged leaves. With the enlargement of the leaf spots, the yellow areas of the leaves are also enlarged until the whole leaves are yellow. In severe cases, the surface of the leaves will also produce mildew, which will accelerate the drying of the leaves and the whole plant. When the fruit is sick, a round black disease class is formed near the fruit stalk, and the hardening is slightly depressed and cannot be eaten.
Second, prevention and treatment technology
1. Agricultural control: In the severely ill area, the diseased leaves and old leaves of the lower part of the plant are removed in time, and the light disease area is pruned in time to facilitate ventilation and light transmission.
2. Ecological control: Strengthen the humidity control of the room temperature, timely ventilation, proper control of watering, timely dehumidification after watering, and when the sunny day is sufficient, the greenhouse will be warmed to 30 °C-36 °C in time, which will obviously inhibit the pathogens. .
3. Chemical control: In the early stage of the disease, you can choose 70% methyl thiophanate 800 times solution, or 72% gram mold net 800 times solution, or 58/% metalaxyl manganese Zn WP 500 times solution, or 75% Bacterial clear WP 600-800 times solution, or 50% carbendazim WP 800-1000 times solution, interval 7-10 days to prevent once, even prevent 2-3 times. After rainy days or watering, choose 10% chlorothalonil aerosol 300-350 grams, fumigation in the evening, use it every 10 days; or 5% chlorothalonil dust 1 kg per acre, every 10-15 Day again, once again.
Author: Zhang Cheng Lock
Source: Shanxi Science and Technology News
Mainly harmful to the leaves. In the early stage of the disease, the leaves are white and mildewed, and the lesions are nearly circular to irregular. When the mold spots are mixed for a long time, they are covered with leaf backs, and the mildew spots turn brown to dark green. Oval or irregular yellowish chlorotic spots appear on the front of the damaged leaves. With the enlargement of the leaf spots, the yellow areas of the leaves are also enlarged until the whole leaves are yellow. In severe cases, the surface of the leaves will also produce mildew, which will accelerate the drying of the leaves and the whole plant. When the fruit is sick, a round black disease class is formed near the fruit stalk, and the hardening is slightly depressed and cannot be eaten.
Second, prevention and treatment technology
1. Agricultural control: In the severely ill area, the diseased leaves and old leaves of the lower part of the plant are removed in time, and the light disease area is pruned in time to facilitate ventilation and light transmission.
2. Ecological control: Strengthen the humidity control of the room temperature, timely ventilation, proper control of watering, timely dehumidification after watering, and when the sunny day is sufficient, the greenhouse will be warmed to 30 °C-36 °C in time, which will obviously inhibit the pathogens. .
3. Chemical control: In the early stage of the disease, you can choose 70% methyl thiophanate 800 times solution, or 72% gram mold net 800 times solution, or 58/% metalaxyl manganese Zn WP 500 times solution, or 75% Bacterial clear WP 600-800 times solution, or 50% carbendazim WP 800-1000 times solution, interval 7-10 days to prevent once, even prevent 2-3 times. After rainy days or watering, choose 10% chlorothalonil aerosol 300-350 grams, fumigation in the evening, use it every 10 days; or 5% chlorothalonil dust 1 kg per acre, every 10-15 Day again, once again.
Author: Zhang Cheng Lock
Source: Shanxi Science and Technology News
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