During the winter and spring season, vegetable seedlings are planted in greenhouses, and the mu bed will fail due to low temperature, lack of light, poor ventilation, and high humidity. The following describes the prevention and control measures:
Sterile bed soil was chosen. When growing vegetables, use fertile, field soils that have not been sown with solanaceous fruits, melons, and cruciferous vegetables for 5 consecutive years. Sandy soil is better, and care should be taken to select within 13-17 cm. Topsoil, do not use garden soil for bed soil. In order to prevent the spread of soil bacteria, bed soil can be disinfected. There are many disinfection methods. Commonly used are:
(1) Carbendazim disinfection. 5-30% carbendazim WP 25-30 grams per 1000 kg bed soil, when processed, first carbendazim into an aqueous solution, and then sprayed on the bed soil, mix well and cover it with a plastic film, generally by 2 - Kills various pathogens such as blight in the soil in 3 days.
(2) Formalin disinfection. Formalin, water, and bed soil are sprayed and mixed uniformly at a ratio of 1:100: (4000 - 5000), then piled up and covered with a plastic film. After 2-3 days of boring, the film is peeled off to promote the gas. Distribute it so that it can be used after 1-2 weeks.
Seed treatment. Seed soaking in warm water at 50°C for 15 minutes, followed by cooling with cold water, drying after sowing, with obvious disinfection effect. In addition, it is also possible to use 50% carbendazim or 50% thiram wettable powder dressing, the amount of 0.3% of the seed.
Strengthen cultivation management. Water sufficient for watering before sowing, and properly transplant to cultivate strong seedlings; timely and appropriate amount of water, control seedbed humidity, prevent excessive watering, excessive attendance; pay attention to insulation, antifreeze, prevent seedbed temperature is too low; strengthen ventilation, prevent air The air humidity in the seedbed is too high and the harmful gas harms the vegetable seedlings; increase the light as much as possible; when the temperature of the seedbed is ensured, it is appropriate to open the mortar and cover it in a timely manner. Even in cloudy snow weather, the grasshopper must be properly opened to prevent the temperature. Excessively high seedlings cause leggy; timely early seedlings, to prevent the seedlings caused by seedlings.
Chemical control. At the early stage of disease, the diseased seedlings are firstly removed and then sprayed and protected in time to prevent the spread. The commonly used agents are: copper ammonia mixture (copper sulfate 2 parts, plus 11 parts of ammonium carbonate, mix by grinding, seal after 14 hours) 300-400 times solution, 50% carbendazim 600 times solution, 75 % Pyridoxime or 70% Trichloromethane WP 600-800 times.
Sterile bed soil was chosen. When growing vegetables, use fertile, field soils that have not been sown with solanaceous fruits, melons, and cruciferous vegetables for 5 consecutive years. Sandy soil is better, and care should be taken to select within 13-17 cm. Topsoil, do not use garden soil for bed soil. In order to prevent the spread of soil bacteria, bed soil can be disinfected. There are many disinfection methods. Commonly used are:
(1) Carbendazim disinfection. 5-30% carbendazim WP 25-30 grams per 1000 kg bed soil, when processed, first carbendazim into an aqueous solution, and then sprayed on the bed soil, mix well and cover it with a plastic film, generally by 2 - Kills various pathogens such as blight in the soil in 3 days.
(2) Formalin disinfection. Formalin, water, and bed soil are sprayed and mixed uniformly at a ratio of 1:100: (4000 - 5000), then piled up and covered with a plastic film. After 2-3 days of boring, the film is peeled off to promote the gas. Distribute it so that it can be used after 1-2 weeks.
Seed treatment. Seed soaking in warm water at 50°C for 15 minutes, followed by cooling with cold water, drying after sowing, with obvious disinfection effect. In addition, it is also possible to use 50% carbendazim or 50% thiram wettable powder dressing, the amount of 0.3% of the seed.
Strengthen cultivation management. Water sufficient for watering before sowing, and properly transplant to cultivate strong seedlings; timely and appropriate amount of water, control seedbed humidity, prevent excessive watering, excessive attendance; pay attention to insulation, antifreeze, prevent seedbed temperature is too low; strengthen ventilation, prevent air The air humidity in the seedbed is too high and the harmful gas harms the vegetable seedlings; increase the light as much as possible; when the temperature of the seedbed is ensured, it is appropriate to open the mortar and cover it in a timely manner. Even in cloudy snow weather, the grasshopper must be properly opened to prevent the temperature. Excessively high seedlings cause leggy; timely early seedlings, to prevent the seedlings caused by seedlings.
Chemical control. At the early stage of disease, the diseased seedlings are firstly removed and then sprayed and protected in time to prevent the spread. The commonly used agents are: copper ammonia mixture (copper sulfate 2 parts, plus 11 parts of ammonium carbonate, mix by grinding, seal after 14 hours) 300-400 times solution, 50% carbendazim 600 times solution, 75 % Pyridoxime or 70% Trichloromethane WP 600-800 times.
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