1. Requirements for seedbeds: The disease-free plots with high topography, leeward yang, unobstructed drainage, and loose and fertile soil should be selected for the seedbed. Bed soil should be made of disease-free new soil. If old bed soil or old garden soil is used, there is a possibility of colonization. Bed soil disinfection should normally be carried out. The method is to use 50% carbendazim or 50% thiophanate-methyl wettable powder 10g, 25% metalaxyl wettable powder 5g per square meter seedbed and 5 kg of fine soil, and pour the seedbed before spraying. Bottom water, after infiltrating the water, take 1/3 of the well-mixed medicinal soil and spread it on the surface. After sowing, cover the rest of the 2/3 of the medicinal soil on the seeds, so that the seeds are caught in the middle of the soil, and the effect is obvious and the efficacy is effective. long time. In order to prevent the introduction of pathogenic bacteria into the seedbed, adequately composted compost should be applied. 2. Strengthen seedbed management: seeds before sowing with 0.1% of 60% carbendazim hydrochloride ultrafine powder plus 0.1% Pingping soaking seeds for 50 to 60 minutes, rinse and clean after germination, is conducive to emergence. Nutrient seedlings or electric hotbed nursery, do a good job of seedbed frost insulation facilities. Cooling bed nursery should use insulation coverings, timely uncovering and controlling seedbed temperature. Control the watering of the seedbed and keep the surface of the bed soil dry. The air humidity in the shed should be 60% to 80%. Seedlings are watered in the sunny and warm weather from 10 to 12 o'clock in the morning. After watering, they are dampened at noon. Avoid watering in the evening so as not to increase the humidity in the greenhouse after the water is enclosed to prevent the disease. Increased light can improve the disease resistance of seedlings. As long as the seedbed temperature permits, it is necessary to remove the opaque cover on the seedbed as soon as possible, cover it properly in the afternoon and cover it on rainy days. 3. Chemical control: For damping-off disease, blight and anthrax, the initial stage of the disease is sprayed with 15% of Toxicloxone 400 times, 2~3 kilograms per square meter of nursery seedlings; 58% of anti-drug is also available. Mn-Zn 500 times or 75% chlorothalonil wettable powder 500 times or 50% thiophanate-methyl wettable powder 500 times spray, the control effect is very good. For seedling gray mold and sclerotium, it can be sprayed with 50% fasting WP 1000 times solution or 30% naroli wettable powder 1000 times solution. The above agents are sprayed once every 7 to 10 days during the onset of disease, and sprayed continuously for 2 to 3 times. For the prevention and control of roots, the fundamental measure is to reduce soil moisture and increase soil temperature.
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