Prevention and control of vegetable seedling stage

1. Symptoms Seedlings can be harmed after they are unearthed, especially in the middle and late stages. The base of the diseased seed became brown, and the diseased part contracted finely, and the stems and leaves succumbed to death. In the early stage of the disease, the seedlings wilted and recovered at night. When the lesions circled the stem for a week, the seedlings gradually died, and the leaves were wilted and could not be restored until they stood upright. The lesions are initially elliptical dark brown, with concentric circles and pale brown spider silk mold, and the formation of sclerotia in the later stage, is another important feature distinguishing from the disease.
2. Route of transmission and pathogenesis The disease is caused by the infection of the nucleus of the nucleus, and the temperature of the pathogen is 24 °C. If the seeding is too dense, the seedlings or the seedlings are not timely, the seedlings are long, the temperature is too high, the ventilation is poor, or the soil moisture is high or low, and the disease is easily induced. Often infested from roots, young stems and wounds.
3. Control method Seedbed treatment. Refer to the disease.
Seed treatment. Seed dressing with 40% of the seed weight of 40%, or seed dressing with 50% thiram. Strengthen seedbed management. Pay attention to improve the ground temperature, scientific ventilation, and prevent high temperature and high humidity in the seedbed.
In the early stage of the disease, spray 50% of the dry WP 800 times solution, 36% thiophanate-methyl suspension 500 times solution, or 70% mancozeb WP 600 times solution or 5% Jinggangmycin water 1500 times the solution. When the disease is mixed and the blight is mixed, it can be sprayed with 50% Fumei double wettable powder 800 times, 2 to 3 liters per square meter, once every 7 to 10 days, and continuously controlled 2 to 3 times.

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