In the greenhouse vegetable production, the enclosed and moist environmental conditions in the shed provide suitable conditions for the development of pests and diseases. The annual production of greenhouse vegetables provides an appropriate place for winter diseases and insect pests. Therefore, the incidence of vegetable pests and diseases in greenhouses is wide, spreads quickly, and is heavy. It has a great impact on vegetable production. Therefore, prevention and control of vegetable pests and diseases in greenhouses is an important part of management. So how can we prevent and control pests and diseases from the root and prevent the occurrence and spread of pathogenic bacteria and eggs? First, seed disinfection Some pathogenic bacteria and eggs are often latent or mixed on the surface or inside of the seeds of vegetables. Disinfecting seeds before sowing can kill most of the pathogenic bacteria or eggs. Commonly used disinfection methods include soaking in warm soup and seed dressing. 1. Warm soup soaked. Usually soaked with warm water 50 °C -60 °C 5-15 minutes soaking should be constantly stirring, so that the seeds heated evenly. 2. Chemical seed dressing. Formalin soaking with 0.1% copper sulfate, 0.1% potassium permanganate or 300 times can be used. Can also be seeded with 0.3%-0.4% of 50% carbendazim WP. Second, high-temperature stuffy shed Before planting vegetables, choose sunny days and close the greenhouse with plastic film. Under strong light, let the temperature in the greenhouse quickly rise above 50°C and keep it for 7-10 days to kill the pathogens on the surface soil, wall and column. And eggs, reduce the source of infection. In general, the maximum temperature in a shed can reach about 70°C in summer and autumn when the temperature is high, and most of the bacteria and insects in the shed can be killed at this temperature for 7 days. In the high-temperature stuffy shed, per cubic meter of shed space, with a homogeneous mixture of 3 grams of sulfur powder, 5 grams of sawdust, and 1 gram of dichlorvos smoke, ignited under low heat, closed smoke; or according to the area of ​​the shed, with special soil The fumigation and disinfection agent, dil, 15g/m2, was diluted with water and then flushed into the soil with water to seal the smoked shed. However, after smoking, it should be released for 2-3 days and then site-planted. Third, the disinfection of soil chemicals Some pathogenic bacteria or eggs often exist in the soil. Before sowing or planting, disinfection of greenhouse soil can kill pathogens or eggs and reduce pests and diseases in the growing season. When the soil is disinfected, one of the following agents can be selectively targeted according to the occurrence of diseases and pests perennial: 50% carbendazim WP, 50% thiram WP, 5% phoxim granules, will be selected Add a proper amount of fine dry soil and spread it evenly on the surface, and then pour it into the soil. Seed bed disinfection can be used 50% Ableb wettable powder or 50% thiram wettable powder, 1/3 spread on the seedbed, 2/3 spread on the seed after sowing, that is, under the cover, the vegetable seedling pests and diseases Has a clear control effect. Pay attention to keep the surface of the bed moist, so as to avoid phytotoxicity.
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How to Prevent and Control Pests and Diseases of Vegetables from the Roots