"Smoke up" in the greenhouse for preventing pests and diseases of vegetables in winter
In the production of greenhouse vegetables, the ventilation and dehumidification is not good in cloudy days. Conventional chemical sprays will increase the humidity of the indoor air in the greenhouse. Therefore, it is often recommended to use aerosols to prevent and control greenhouse diseases and insect pests, but improper use will often cause pesticide damage. Therefore, the following points must be grasped when using fumigant for shed vegetables:
Strictly grasp the medication time
In the vegetable growing process or the empty shed after harvest, smoke can be used to fumigate the shed to prevent and control vegetable diseases and insect pests. The smoking shed time is carried out in the evening or on a cloudy day, which is conducive to the sinking of smoke particles and has an ideal control effect. After smoking the shed at night, the next morning should be fully ventilated, and then agricultural operations. When smoking the shed on a cloudy day, pay attention to the weather forecast. If it rains the next day, do not smoke the shed the night before, so as not to smoke the shed for a long time and cause vegetable phytotoxicity. The shed can be smoked during the day even in rainy and snowy weather. During the day, the shed must be closed for 4-6 hours (in special cases, it usually does not exceed 8-12 hours). Ventilation and exhaust should be carried out when there is no rain or snow. operation.
Determine the number of medications carefully
Disease prevention and control: In the early stage of the disease, use the medicine, and generally only need to smoke the shed once to achieve the control effect. In the middle and late stages of the disease, the shed is generally smoked once every 7-10 days and used 2-3 times in a row.
Pest control: It should be used in the initial stage of pests, and smoked once every 5-7 days. Depending on the occurrence of pests, smoke 2-3 times. In addition, the fumigant generally cannot kill the eggs or larvae in the soil and leaves.
Strict application method
Evenly arranging points: arranging multiple points, evenly arranging points, generally 3-5 setting points per mu. Then use bricks or iron wire as a support, and spread the fumigant 20-50 cm above the ground to ensure that the smoke spreads and spreads evenly in the space.
Ignite from the inside to the outside by a dark fire: when igniting, it should be ignited in order from the inside to the outside of the shed, and finally ignite the smoke agent at the door of the shed. When ignited, it must be ignited with a dark fire such as a cigarette or incense. After all igniting, the operator should leave the greenhouse immediately and seal the room quickly.
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