1. There are two types of pesticides used to kill nematodes. One is the obligate nematicide, which is a pesticide that specifically controls nematodes. The other is a facultative nematicidal agent. This nematicide has many uses, such as chlorination. The bitter, methyl bromide and drip mixture have poisonous crops against underground pests, pathogenic bacteria and nematodes, and cotton can kill nematodes, kill insects, sterilize and weed.
Second, according to crop classification, divided into fumigation nematicides and non-fumigation nematicides.
Third, according to the chemical structure classification, divided into:
1. Organic sulfurs, such as carbon disulfide, carbon oxysulfide 2. Halogenated hydrocarbons such as chloropicrin, methyl bromide, methyl iodide, dichloropropane, dibromohexane, dibromopropane, dibromoethylene, dibromochloropropane, Bromochloropropane. This type of nematicide has a high vapor pressure, mostly a soil fumigant, which directly kills nematodes by spreading the agent through the soil. However, due to the disadvantages of high toxicity to humans and high dosage in the field, the development of such nematicides has been restricted, and dibromoethane and dibromochloropropane have been banned.
3. Methyl thioisothiocyanate, such as Weibaimu, Mianlong. This type of nematicide releases methyl thioisothiocyanate, which releases cyanide ions and kills nematodes.
4. Organic phosphorus. Such as line phosphorus, Fengsuo phosphorus, amine line phosphorus, butaline phosphorus, benzene line phosphorus, propyl phosphorus, sulphur phosphorus, chlorpyrifos (Miler). These nematicides have developed rapidly and have more varieties. Its mechanism of action is that cholinesterase is inhibited and poisoned, and nematodes are generally sensitive to such agents. Many varieties have a systemic effect, while others have a contact-killing effect. The common feature is that the nematicidal spectrum is relatively wide and there are few residues in the soil, which is an ideal nematicide.
5. Carbamates, such as 涕æ¥å¨, carbofuran, butyl thiocarbamate (good winter). Its mechanism of action is mainly to damage nerve activity, reduce nematode migration, infestation and feeding on plants, thereby reducing the reproduction and harm of nematodes. The nematicidal spectrum of such nematicides is relatively broad, but the toxicity is very high. Carbofuran is a highly toxic pesticide, and it is a highly toxic pesticide.
6. Other. Such as dichloroisopropyl ether, grass Weiwei, formaldehyde.
Drip blends, dibromoethane, and dibromopropane have been widely used nematicides, but since the 1,2-dichloropropane in drip blends is too low, it is not currently on sale. Dibromoethane has been teratogenic and carcinogenic to animals and has been banned. In addition to line phosphorus is the first organophosphate nematicide, it is also the first non-fumigant nematicide, but the nematicides used in China's production mainly include phenylphosphorus, propylphosphine, sulphur, and chlorine. Oxazophos, methylisophosphorus, aldicarb, carbofuran and other varieties.
Huaxian County Plant Protection Station Chen Yipin
Second, according to crop classification, divided into fumigation nematicides and non-fumigation nematicides.
Third, according to the chemical structure classification, divided into:
1. Organic sulfurs, such as carbon disulfide, carbon oxysulfide 2. Halogenated hydrocarbons such as chloropicrin, methyl bromide, methyl iodide, dichloropropane, dibromohexane, dibromopropane, dibromoethylene, dibromochloropropane, Bromochloropropane. This type of nematicide has a high vapor pressure, mostly a soil fumigant, which directly kills nematodes by spreading the agent through the soil. However, due to the disadvantages of high toxicity to humans and high dosage in the field, the development of such nematicides has been restricted, and dibromoethane and dibromochloropropane have been banned.
3. Methyl thioisothiocyanate, such as Weibaimu, Mianlong. This type of nematicide releases methyl thioisothiocyanate, which releases cyanide ions and kills nematodes.
4. Organic phosphorus. Such as line phosphorus, Fengsuo phosphorus, amine line phosphorus, butaline phosphorus, benzene line phosphorus, propyl phosphorus, sulphur phosphorus, chlorpyrifos (Miler). These nematicides have developed rapidly and have more varieties. Its mechanism of action is that cholinesterase is inhibited and poisoned, and nematodes are generally sensitive to such agents. Many varieties have a systemic effect, while others have a contact-killing effect. The common feature is that the nematicidal spectrum is relatively wide and there are few residues in the soil, which is an ideal nematicide.
5. Carbamates, such as 涕æ¥å¨, carbofuran, butyl thiocarbamate (good winter). Its mechanism of action is mainly to damage nerve activity, reduce nematode migration, infestation and feeding on plants, thereby reducing the reproduction and harm of nematodes. The nematicidal spectrum of such nematicides is relatively broad, but the toxicity is very high. Carbofuran is a highly toxic pesticide, and it is a highly toxic pesticide.
6. Other. Such as dichloroisopropyl ether, grass Weiwei, formaldehyde.
Drip blends, dibromoethane, and dibromopropane have been widely used nematicides, but since the 1,2-dichloropropane in drip blends is too low, it is not currently on sale. Dibromoethane has been teratogenic and carcinogenic to animals and has been banned. In addition to line phosphorus is the first organophosphate nematicide, it is also the first non-fumigant nematicide, but the nematicides used in China's production mainly include phenylphosphorus, propylphosphine, sulphur, and chlorine. Oxazophos, methylisophosphorus, aldicarb, carbofuran and other varieties.
Huaxian County Plant Protection Station Chen Yipin
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