Major Diseases of Vegetables - Blight Disease at Seedling Stage
1. Symptoms of seedlings can be damaged after unearthing, especially in the middle and late period. The base of the diseased seedlings became brown, and the posterior diseased part shrank and the stems and leaves wilted and died. Slightly diseased seedlings wilted during the day and recovered at night. When the lesions circled the stems for one week, the seedlings gradually withered and the leaves wilted could not be recovered until they died of erection. At the beginning of the lesion, the lesion was dark brown with an oval shape, with concentric ring and light brown spider silk mold. The later formation of sclerotia was another important feature that distinguished from damping-off.
2. Transmission and disease conditions The disease is caused by the infection of Rhizoctonia solani, and the optimum temperature for the development of the pathogen is 24°C. Seeding too densely, seedlings or sub-seedlings is not timely, resulting in leggy seedlings, excessive temperature, poor ventilation, or high or low soil moisture can easily induce the disease. Attacks often occur from roots, young stems, and wounds.
3. Prevention and treatment methods seedbed treatment. Refer to damping-off.
Seed treatment. Use 0.3% of the seed weight for 40% of the seed dressing, or use 50% thiram for seed dressing. Strengthen seedbed management. Pay attention to raising the ground temperature and scientific ventilation to prevent the emergence of high temperature and humidity in the seedbed.
At the beginning of the onset of spraying, 50% of the Rhizoctonia WP 800 times, 36% of Thiophanate Suspension 500 times, or 70% of Mancozeb WP wet 600 times or 5% Jinggangmycin 1500 times liquid agent. When damping-off and blight are mixed, it can be sprayed with 50% thiram WP 800 times, 2 to 3 liters per square meter, 7 to 10 days, continuous control 2 to 3 times.
2. Transmission and disease conditions The disease is caused by the infection of Rhizoctonia solani, and the optimum temperature for the development of the pathogen is 24°C. Seeding too densely, seedlings or sub-seedlings is not timely, resulting in leggy seedlings, excessive temperature, poor ventilation, or high or low soil moisture can easily induce the disease. Attacks often occur from roots, young stems, and wounds.
3. Prevention and treatment methods seedbed treatment. Refer to damping-off.
Seed treatment. Use 0.3% of the seed weight for 40% of the seed dressing, or use 50% thiram for seed dressing. Strengthen seedbed management. Pay attention to raising the ground temperature and scientific ventilation to prevent the emergence of high temperature and humidity in the seedbed.
At the beginning of the onset of spraying, 50% of the Rhizoctonia WP 800 times, 36% of Thiophanate Suspension 500 times, or 70% of Mancozeb WP wet 600 times or 5% Jinggangmycin 1500 times liquid agent. When damping-off and blight are mixed, it can be sprayed with 50% thiram WP 800 times, 2 to 3 liters per square meter, 7 to 10 days, continuous control 2 to 3 times.
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