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The use of aerosols to control diseases and insect pests such as fruits and vegetables in greenhouses is a technique for controlling pests and diseases by condensing pesticides into smoke particles or directly dispersing pesticides into aerosol particles. It has high efficacy, low residue, time saving, labor saving, and medicine. Pay attention to the following points in this technology:
1. Choose the time of application: Under the sunlight, because the temperature of the plant is the same as the temperature of the smoke, the smoke is not easy to deposit, which will affect the efficacy. Therefore, it is best to apply the smoke after sunset in the evening. 2. Casting method: The aerosol is placed in the greenhouse, and the position should be evenly distributed according to the area. When it is discharged, it should be ignited in the order of dark fire. After ignition, the greenhouse will be closed overnight, and the next morning, the air will be ventilated. 3. Appropriate amount of application: There are currently stereotyped products produced by pesticide factories on the market. For example, 45% chlorothalonil aerosol, the amount of greenhouse per mu is 200 ~ 250 grams, once every 7 to 10 days, can control cucumber downy mildew, blight, tomato blight, gray mold and so on. The aerosol can also be made by the earth method. It is mixed with 500 grams of wood chips per acre with 200-250 grams of sulfur powder. It can be applied at 3 points to control cucumber downy mildew and powdery mildew. Control vegetable aphids and whiteflies, use appropriate amount of wood chips per acre, and absorb 80-300 ml of 80% dichlorvos emulsifiable concentrate to make dichlorvos aerosols. Place them in tiles or pots. However, the self-made method must strictly control the dosage and control the rate of pesticide discharge, so that it can be released slowly, so as not to cause phytotoxicity. 4. Pay attention to safety and effective use: The aerosol is easy to get wet, and it should be protected from moisture when it is stored. Once it is damp, it can be placed in a ventilated place and dried slowly. Take care to avoid crops and flammable materials when using the medicine. After ignition, the operator should immediately leave the shed and close the shed door. After 2 hours of ventilation the next day, they can enter the shed to prevent poisoning.
In recent years, with the deepening of agricultural science and technology, local governments have used greenhouses to grow economic crops, and have achieved good economic benefits in off-season production. Because of its unique temperature and humidity, greenhouse pests are also more serious. In the prevention and control, a more effective means is to use aerosols for chemical control.
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