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1. Highly toxic pesticides (LD50<50mg/kg): There are 3911, Suhua 203, 1605, methyl 1605, 1059, chlorpyrifos, monocrotophos, phosphonium, methamidophos, isopropyl phosphate, trisulfide, oxidation Dimethoate, zinc phosphide, aluminum phosphide, cyanide, carbofuran, fluoroacetamide, arsenic, insecticide, celidine, celia, ulcer, chloropicrin, pentachlorophenol, dibromochloropropane , 401, etc.
2. Medium-toxic pesticides (LD50 between 50-500mg/kg): there are chlorpyrifos, dimethoate, rice flour, ethion, imipenem, picophos, hexachlorocyclohexane, hexamethylene hexahydrate, poison Killing fen, chlordane, DDT, carbaryl, chlorpyrifos, YE è‰, ç å¨, ç å¨, èšœ ã€, fenthion, dichlorvos, pyrethroids, 克瘟散, rice bran , Dixon, 402, Fumei arsenic, rice foot green, bacteriophage, dexamethasone, Daisen ring, 2,4-D, oats, chlorpyrifos and so on.
3. Low-toxic pesticide (LD50>500mg/kg): trichlorfon, marathon, acephate, phoxim, dicofol, carbendazim, thiophanate, captan, zinc, thiram, rust , Isophora, Ethyl aluminum phosphate, chlorothalonil, herbicide ether, chlorpyrifos, atrazine, chloralamine, cable, chlorpyrifos, 2 methyl 4-chloro, chloromeron, diuron, fluoride Leling, bentazon, thatch, and glyphosate.
According to the safe use standards of pesticides, all varieties that have been formulated with "safety standards for pesticide use" are implemented in accordance with the "standard" requirements. The "standard" variety has not been developed and the following regulations are implemented:
1. Highly toxic pesticides: Not allowed for crops such as vegetables, tea, fruit trees, Chinese herbal medicines, etc., not for use in the prevention and treatment of sanitary pests and human and animal skin diseases. Except for rodenticides, it is not allowed to be used for poison rats. Fluoroacetamide is prohibited from being used on crops and is not allowed to be used as a rodenticide. "3911" emulsifiable concentrate is only allowed for seed dressing. Spraying is strictly prohibited. Carbofuran granules are only used for seed dressing. Use tool ditch or gloves to spread poisonous soil. Do not spray after immersion.
2. High-residue pesticides: BHC, DDT, and chlordane are not allowed to be used on crops such as fruit trees, vegetables, tea trees, Chinese herbal medicines, tobacco, coffee, pepper, and lemongrass. Chlordane is only used for seed dressing to control underground pests.
3. Insecticide: It can be used to control cotton red spider, rice aphid and so on. According to the results of the study on the toxicity of insecticides, it should be controlled. It is only used once during the whole growth period of rice. Use 25% water agent per acre 100g, no less than 40 days from the harvesting period, 200g 25% water agent per acre, no less than 70 days from the harvesting period, prohibiting other food, oil, vegetables, fruit trees, herbs Use on tea, tobacco, sugar cane, sugar beets and other crops. When controlling cotton pests, the number of uses and the amount of use should also be controlled as much as possible. When spraying, avoid direct contact with the agent.
4. It is forbidden to use pesticides to poison fish, shrimp, frogs and beneficial birds and beasts.
According to the comprehensive toxicity evaluation (acute oral, dermal toxicity, chronic toxicity, etc.) of commonly used pesticides (original drugs) in agricultural production, they are classified into three categories: high toxicity, moderate toxicity and low toxicity.
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