The fumigant is formulated by special methods such as pesticides, heat generators, oxidizers, dispersants and the like. The application of the fumigant to the current production is a new method of application of pesticides for preventing and controlling vegetable and fruit in the shed. Due to its simple method, remarkable effect, low cost, low residue, and strong broad spectrum, it is a good way for pollution-free green food, and it is welcomed by a large number of vegetable farmers. The types of fumigants currently on the market and available for use in the market include bacteriostatic and disease-preventing fumigants such as chlorothalonil, prodrug, and insecticidal cockroaches; as well as insecticidal fumigants such as dichlorvos. The above techniques for the use of fumigants are: 1. Normally performed after dusk, but rainy or snowy days can also be performed during the day. 2. In the shed, more points should be laid and evenly set, and iron wire, masonry, ceramics should be used as the support, and the fumigant should be supported at a height of 20 to 30 cm from the ground. 3. During the discharge, the room shall be fired from the inside to the outside (in the absence of an open flame) so that it can continue to emit smoke. After the ignition, the doors and windows are closed overnight. After the morning ventilation, the farm operation can be carried out, such as during the day. After 6 hours of sealing, the air is allowed to work again. 4. Under normal circumstances, the commonly used amount of fumigant is 0.3-0.4 g/m3, and the equivalent of fumigation agent for mu is 300-400 g. 5, prevention and treatment of disease should be started in the early stages of drug use, once every 5 to 7 days, can be shared two or three times; and pest control is on-site investigation in the shed, such as when the insect strain is about 30% medication, and do Two consecutive times (1 to 2 days apart) will do. 6. The volume of greenhouses and greenhouses should not be too small (dwarf below 50 cm, width less than 150 cm is unqualified) in order to avoid phytotoxicity. 7. Control fungal diseases of melons and solanaceous fruit (rhizome, anthrax, epidemic disease, tripping down, withering, rot, and gray mold), and 45% chlorothalonil or 15% carbendazim fumigant can be used. The amount of mu is 300g; for insect pests such as aphids, red spiders, whitefly, yellow slug melon, cabbage caterpillar, etc., multiple insects clear or dichlorvos fumigant can be used, and the amount of mu is 400g, which can control the occurrence and development of pests and diseases.
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