Smoke-type pesticides can help crops remove many “troublesomes†and allow crops to grow healthily. However, in the application process, it is necessary to pay attention to the rules for the application of smoke-type pesticides in order to better achieve the desired results: 1. Correct choice of aerosols According to the type of pests and diseases to choose the appropriate pharmaceutical species. Such as cucumbers, tomatoes, leeks, etc. before the colonization, use 30% chlorothalonil smoke smoke, can prevent early downy mildew, anthrax, gray mold, early blight; when cucumber, tomato and other crops when leaf mold occurs , Should choose to use 10% fast keling smoke fume control; control aphids, whitefly and other pests, you can use 22% dichlorvos smoke smoke; if a variety of pests and diseases, you need to choose compound aerosol. Pharmacy must use the regular manufacturers of small packaging products, with a weight of 40 to 50 grams per package is appropriate, so that when the use of large packaging can save the trouble. Do not use aerosols as solutions for dilution, such as spraying or irrigating roots. Second, the pre-combustion chamber to be sealed, the discharge time to properly use the smoke agent to carefully check the closure of the entire studio, repair the loopholes and gaps in the shed film, closed vents, to ensure that the entire studio sealed airtight. The discharge should not be carried out during the day, because under the sunlight, the temperature of the plant body is the same as the temperature of the smoke granules, and the smoke is not easily deposited on the crop, which will affect the exertion of the efficacy. Should be ignited in the evening after the cover grass to the best, the cloudy sky, snow, the evening of the best discharge of the effect, this time the smoke particles tend to precipitate in the plant body, so that the control effect greatly improved. Third, strictly control the amount of medication according to the size of the greenhouse space, the content of active ingredients of the aerosol and crops of different growth periods, to determine the amount of drugs. The amount of tall drugs used in the greenhouse should be high, otherwise the amount of the drug should be less; the amount of the active ingredient with high aerosol content should be less, otherwise the dosage should be increased; in the early stage of crop growth, due to tender seedlings, poor drug resistance, and prone to phytotoxicity, The dosage should be reduced as appropriate. Generally, 0.2-0.3 grams per cubic meter of space is used for each dose in the general greenhouse, and 0.4 gram per cubic meter of space can be increased in greenhouses with severe pests and diseases. If the amount of pharmaceuticals is too much, it will not only increase the cost of prevention but also cause phytotoxicity. Of course, it is not free to reduce the amount of medication, so as not to cause a decrease in control effectiveness. Application of pesticides should be carried out at the initial stage of pests and diseases. If the occurrence of severe diseases and pests occurs, it should be used continuously for 2 to 3 times and the interval between application is 5 to 7 days. Fourth, the application of pesticides should be standardized to choose to rely on the northern wall of the booth room to put medicines at the aisle, the chemicals should not be close to the crop, to avoid the occurrence of phytotoxicity when discharged. Because of the high humidity in the greenhouse, the chemicals should be placed on dry bricks. The firing point should be even, usually set 4 to 5 firing points per acre, from the inside out in order to use the dark fire to ignite, after all lit, quickly leave the scene, closed booths. After 12 hours of fumigation and open ventilation in the shed, personnel can enter the shed.
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