First, the symptoms
When the leaves are attacked, they usually start from the old leaves close to the ground and spread upwards. The back of the leaves has water-spotted small round spots. The edges of the leaves appear dark brown on the front and back, and the center is grayish white, round or near-circular, slightly concave. Lesions, scattered above a small amount of small black spots, in severe cases, converging into large spots, so that leaves gradually yellow, premature aging of plants, resulting in early deciduous; stem and fruit disease, lesions nearly round or oval, slightly concave, brown There were scattered black spots on it.
Second, the incidence conditions
1. Warm and humid, lack of light, is conducive to the occurrence of disease.
2. When the temperature is above 15°C, the disease is prone to occur when there is rainy weather and the fertility is insufficient and the plant growth is weak.
3. Diseases that are heavy and low-lying are prone to occur.
Third, control methods
1. Cultivate disease-free strong seedlings. The seeds are collected from disease-free healthy plants, such as seeds, and soaked in a warm soup at 52°C for 30 minutes, and then germinated. The seedbed was planted with new soil or two years without planting nightshade vegetables.
2. Rotation. Seriously diseased and non-solanum crops are subject to a 3-4 year rotation, timely pruning, removal of sick bodies, removal of old leaves, and promotion of air and light transmission.
3. Strengthen cultivation management. Increase phosphorus and potassium fertilizers to improve disease resistance. Cultivation of sorghum, suitable for close planting, pay attention to field drainage and dehumidification, attention to ventilation and scattered wetlands.
4. Chemical control. 70% mancozeb, 58% ledomemi-manganese, 75% chlorothalonil, 64% antimony, 70% thiophanate-methyl, 50% mixed sulfur suspension, etc., at intervals of 7-10 days, 2-3 times in a row.
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