The rules that smoke-based pesticides are invited to follow:
First, the correct choice of aerosols should be based on the type of pests and diseases to choose the appropriate pharmaceutical variety. For example, before planting cucumber, tomato, leek, etc., use 30% chlorothalonil smoke to prevent premature downy mildew, anthracnose, gray mold, early blight; when cucumber, tomato and other crops are mildew It is advisable to use 10% keering aerosol smoke control; to control aphids, whitefly and other insect pests, 22% dichlorvos aerosol can be used; if multiple pests occur at the same time, you need to choose a compound aerosol. The pharmacy must be selected from the small packaging products of regular manufacturers, and the weight of each package is 40-50 grams, so that the trouble of packaging large packages can be saved. Do not dilute the aerosol into a solution, such as spraying or rooting.
Second, the shed should be sealed before the discharge, the discharge time should be properly used before the smoke agent should be carefully checked the closure of the entire shed, repair the vent membrane holes and gaps, close the vents to ensure that the entire shed is not airtight.
Do not discharge during the day, because the temperature of the plant body is the same as the temperature of the smoke granules under the sunlight, and the smoke is not easy to precipitate on the crop, which will affect the efficacy of the drug. It should be ignited in the evening after the cover of the grass, and the best effect on the evening in the cloudy and snowy days. At this time, the smoke particles are easily deposited on the plant body, so that the control effect is greatly improved.
Third, strictly control the dosage according to the size of the greenhouse space, the active ingredient content of the aerosol and the different growth period of the crop, to determine the dosage. The high dose of the greenhouse should be more, on the contrary, the dosage should be less; the dosage of the active ingredient of the aerosol should be less, and vice versa, the dosage should be increased; in the early stage of crop growth, the seedlings are soft, the resistance is poor, and the phytotoxicity is easy to occur. The dose should be reduced as appropriate. Generally, the space for each greenhouse is 0.2-0.3 grams per cubic meter, and the space for pests and diseases can be increased to 0.4 grams per cubic meter. If the amount of the drug is too much, it will not only increase the cost of prevention, but also cause phytotoxicity. Of course, it is not possible to reduce the amount of medication at will, so as not to cause a decrease in the control effect. Application should be carried out in the initial stage of pests and diseases. If the pests and diseases occur more seriously, the drug should be administered continuously for 2 to 3 times, and the interval between application is 5 to 7 days.
Fourth, the application of the drug should be standardized to choose to rely on the north wall of the shed to place the pharmacy, the pharmacy should not be close to the crop, to avoid phytotoxicity when burning. Due to the high humidity of the greenhouse, the chemicals should be placed on the dry tiles. The discharge point should be uniform. Generally, 4 to 5 discharge points are set per acre, and they are ignited by dark fire from the inside to the outside. After all the ignition, they quickly leave the scene and close the booth. After 12 hours of fumigation, the personnel can enter the shed after opening the shed.
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