Pest control chemical is chemical control of pest refers to pharmaceuticals that are mainly used in public health to control vector organisms and pests that affect people's lives. Other name is control chemicals,insect pest control methods,chemical control of pest.It mainly includes agents of mosquitoes control, flies control, cockroaches control, ants control, rats control, and other vector organisms and pests.
Pest control chemical Unlike pesticides that protect agricultural and forestry crops and kill pests in agriculture and forestry, hygienic insecticides act directly in the environment in which humans live, and some even have long contact with humans (eg, space sprays for indoor use, residual spraying Agents, tinctures, mosquito nets, etc.) are protected against humans.
Therefore, in addition to the requirements for pesticides for agriculture and forestry, the requirements for hygienic insecticides still have higher requirements:
1, high toxicity standards. Preparation of acute oral LD50> 5000mg/kg body weight, percutaneous LD50> 2000mg/kg body weight, inhalation LC50> 10000mg/m3 (1h); no significant irritative effects on the skin, eyes, no sensitization; Genotoxicity or mutagenicity, no delayed neurotoxicity; therefore, most hygienic insecticides are currently low-toxicity grades, a few are moderately toxic, and do not require high toxicity and are highly toxic;
2, in the environment can degrade over a certain period of time, does not pollute the environment;
3, the formulation active ingredient (purity) of more than 90%, no odor. Since most insecticides cause poisoning to humans due to the impurities they contain, some insecticides that are used in agriculture as well as in health, such as safrole and malathion, have to be refined and purified. The control of hygiene pests was only promised when high purity had no impurities and no obvious stimulation.
Pest control chemical classification
1.1 Organochlorines Organochlorines are the earliest class of pesticides used for the control of health pests. 666, DDT, and so on have played an important role in the elimination of disease in our province. Because of their high toxicity, high residual levels, and high environmental and human hazards, most of these pesticides have been decommissioned. At present, the only organochlorine insecticide used in our province is trichlorfen (7504), which has contact toxicity and stomach toxicity. The toxicity is low toxicity. It is mainly used in powders, pharmaceuticals and mosquito coils. The
1.2 Organophosphorus pesticides such as these were synthesized in the 1940s and have broad spectrum, high efficiency, low residue, simple synthesis, and low price. They were widely used in the prevention and control of sanitary pests in the 1950s and were the most commonly used insecticides. Agent. The varieties currently used in the province include DDVP, trichlorfon, malathion, chlorimuron, acephate, pirimiphos, fenthion, chlorpyrifos and phoxim. Among them, DDVP has the largest amount of use, most of which is 50% or 80% of EC, and a small amount is used as an aerosol formulation with pyrethroids. As acephate has a good control effect on earthworms, its use is increasing year by year, and is mainly used to kill cockroach baits. The
1.3 Carbamates These compounds are organic synthetic insecticides developed in the 1950s. Their production and use are second only to organic phosphorus. They are not cross-reactive with pyrethroids and can be used as a cross-medication. Commonly used varieties in our province are Zhongding Wei (Basha) and Prozac. Chung Ding Wei mixed with organic phosphorus, pyrethroids, can greatly improve the efficiency and knock down speed, but also for mosquito coils, electric mosquito coils. The chlorpyrifos has a good control effect against cockroaches. Its 1% powder, 20% cream and 1% poison baits are widely used for fleas control, and are often used in propellants and aerosols with 1% concentration. The
1.4 Pyrethroids are the most rapidly developing class of insecticides in recent years, and they are also the most diverse species. Its main features:
(1) High insecticidal activity, which is 1 to 2 orders of magnitude higher than that of general organic phosphorus and carbamate insecticidal activity;
(2) Fast knockdown; Hygienic insecticide
(3) Wide insecticidal spectrum;
(4) Low toxicity to humans and animals. At present, most of the original drugs used as household sanitary insecticides are such pesticides. The pyrethroid insecticides used in the prevention and control of health pests in our province mainly include allethrin and its series of products (dextroprofen, SR-permethrin), tetramethrin and its products (right Tetramethrin), cypermethrin and its series products (cydomethrin, cis-cypermethrin, cypermethrin), fenthrin and its series products (dextro-phenylfenthrin), deltamethrin, permethrin, Phenylmethrin, cyanomethrin, cyfluthrin. The use of methotrexate is the largest, accounting for about 80%; followed by cypermethrin, cypermethrin and deltamethrin. Tetramethrin and permethrin are the main agents for aerosols and propellants; cypermethrin and deltamethrin are mainly processed into wettable powders and suspensions; few are used for aerosols; and allethrins are used in mosquito coils. And electric mosquito coils, a small amount used in aerosols and propellants. The
1.5 Bio-insecticides and insect growth regulators The bio-insecticides used in our province are mainly Bacillus sphaericus and Bacillus thuringiensis. These insecticides are not easy to produce drug resistance and do not pollute the environment. They were produced and used in large quantities between 1993 and 1995. Bio-insecticides have achieved certain control effects on mosquito larvae, but due to social and economic factors, they have ceased production and use in recent years. The application of insect growth regulators in our province is less, and the bait that is mixed with acephate and diflubenzuron is mainly used for the control of earthworms.