Due to the special ecological environment of greenhouse vegetables, the types of pests and diseases are numerous, rapid and heavy. It is a prominent problem in the current production. Here are some simple methods for prevention and control. High temperature stuffy shed method. 1 Miao shed before seedlings. After the shed is completed, choose to cover the greenhouse with sunny days and close the shed for 7-10 days so that the temperature in the shed can reach 60°C or more. This will kill pathogenic spores and eggs on the soil surface and walls, and reduce the incidence of diseases in the vegetable production period. Probability. 2 Miao bored shed. After a few days with a Miao dung shed, it is necessary to pour one pervious water to carry out a field cleaning, remove the diseased leaves and old leaves, and take them out of the shed, spray a protective agent, assist the drowsy shed, and choose sunny noon. Confined, so that the temperature within the shed rose to 42-45 °C, maintain 2 hours, after processing is completed, the vents can not be suddenly enlarged, to slowly cool, and strengthen management, each treatment at least 7-10 days apart, to strictly control Good temperature, if the greenhouse temperature is lower than 42 °C, the effect of inhibiting bacteria is not good. Above 45 °C, plants are easily injured. Seed treatment method. Diseases and insects often latent or mixed in vegetable seeds, seed treatment before sowing, can control the spread of some diseases and pests, the more commonly used seed treatment can be soaked with warm hot agents and pharmaceutical treatment. Warm soaking (vegetable seeds) is generally soaked in warm water of 50-60°C for 5-15 minutes. When soaking, the seeds should be constantly stirred so that the seeds can be heated evenly; the agent can be treated with 0.1% CuSo4, 0.1% KMnO4 or 300-fold forma. Soaking in forests can also be done with 50% carbendazim WP in the ratio of 0.3% to 0.4% of the seed amount. Soil insecticide. According to the law of occurrence of pests and diseases throughout the year, targeted pesticides should be properly mixed with appropriate amount of fine soil and evenly spread on the surface, and then plowed into the soil for soil insecticide. Seedbed disinfection can be carried out using the method of laying on the cover, pay attention to keep the surface of the bed moist, so as to avoid phytotoxicity. Spray control method. Chemical prevention methods should be used scientifically and rationally. First, according to the types of pests and diseases, choose suitable pesticides for prevention and control; Second, according to the occurrence and harm of pests and diseases, strictly control the best period of time and the best dosage, so that timely and appropriate use of drugs Third, to take into account the long-term effects of spraying control, alternating use of pesticides to prevent pests to produce resistance; Fourth, in the simultaneous occurrence of a variety of pests and diseases, mixed medication, making a medication can prevent a variety of pests and diseases; Flexible selection of pesticide formulations and application methods according to weather changes; Sixth, strict implementation of pesticide application procedures should be used to avoid poisoning accidents.
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