The discovery of pyrethroid insecticides is a qualitative leap of pesticides, pesticides from the highly toxic, highly toxic organophosphorus insecticides to pyrethroid insecticides with high efficiency and low toxicity, but also make the new pesticide species more diverse, making a large number of organophosphorus insecticides gradually out of the market. The introduction of highly effective cyhalothrin, due to its many advantages, soon became the most popular pyrethroid insecticide with the largest sales volume, the most widely used and the most popular in the market, completely replacing cyhalothrin. What is the difference between beta-cyhalothrin and cyhalothrin?
The discovery of cyhalothrin
Cyhalothrin is also called trifluorocyhalothrin. Was developed in 1980 a high-efficiency strain pesticides, is a mixture of four isomers of pesticides, active, three isomers are cis body, have tag and stomach poison effect, permeability and no systemic slightly, is a kind of insecticidal, acaricidal agent, of lepidoptera, coleoptera and half orders, such as a variety of insects and other pests, And tetranychus mite, rust mite, gall mite, tarsus mite and so on have good control effect.
Development of highly efficient cyhalothrin
Beta-cyhalothrin was developed by A RJutsum and other British scientists in 1984, and was launched by Syngenta in the same year, under the trade name Karate (Kung Fu). Effective chloric fluorine with ester in removing chlorine fluorine with ester on biological activity of the product resulting from the enantiomers, its insecticidal activity than CFC cyanide chrysanthemum ester high more than 2 times, is the highest strain pesticide active low toxicity pesticides, pest control scope expanded significantly, its usage is greatly reduced, and soon became the most popular strain of pesticides.
Main differences between beta-cyhalothrin and cyhalothrin
(1) Composition difference: Cyhalothrin contains 4 isomers, of which only 3 are active; Beta-cyhalothrin The product obtained by removing a pair of non-biologically active enantiomers from the cyhalothrin variety, containing two isomers and a pair of diastereomers.
(2) Difference in activity: Due to the removal of a pair of inactive isomers, beta-cyhalothrin is more single in composition, and its insecticidal activity is significantly improved, which is 4 times higher than that of beta-cyhalothrin at the same dosage.
(3) Application range difference: cyhalothrin is mainly used to control pests and mites on crops. Beta-cyhalothrin not only can be used to control crop pests, but also can be used to control mosquitoes, flies and other health pests.
(4) Different insecticidal spectrum: Cyhalothrin can be used to control red bollworm and cotton bollworm, cabbage worm, aphid rhomboides rhomboides, tea inchworm, tea caterpillars, peachiostoma and peachiostoma, etc., and can also be used to control tea gall mite, leaf gall mite, citrus leaf moth, orange aphid, citrus tetragmites, rust mite, etc. Beta-cyhalothrin can only be used to control insect pests of lepidoptera, homoptera, hemiptera and Coleoptera such as cotton bollworm, red bollworm, beet armyworm, Spodoptera litura and diamondback moth, but it has no activity against harmful mites.
(5) Different toxicity: Cyhalothrin contains inactive permethrin due to its complex composition, low activity, but significantly increased toxicity. It has been banned from sale in many European and American countries. Although it is not banned in China, it has been completely replaced by highly effective cyhalothrin due to its low activity.
Different: (6) the development situation of CFC’s cyanide chrysanthemum ester because of low activity, high toxicity, high cost, has been rarely used, and efficient cyanogen chloride fluorine chrysanthemum ester due to its high activity, low toxicity, low cost, as is currently the most widely use scope, the highest activity, the best effect, strain pesticide dosage the biggest, is widely used for the prevention and treatment of dozens of agricultural pests, as well as mosquitoes, flies, blatt health pests.