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长期以来,天然除虫菊素是防治害虫的一种理想杀虫剂,具有高效、击倒快、低毒、低残留等优点。但是由于除虫菊花的生产受到土地、气候、栽培条件和劳动力的限制,供应量不大。 四十年代后期,第一个合成拟除虫菊酯丙烯菊酯问世,为拟除虫菊酯杀虫剂的发展开辟了广阔的前景。随着,有许多新的拟除虫菊酯品种不断试制成功,但它们对光的不稳定性限制了应用。 七十年代初,英国M.Elliott合成了二氯苯醚菊酯、氯氰菊酯和溴氰菊酯,以及日本N.ohno合成了戊酸氰醚酯,它们既保持了天然除虫菊素的特点,同时有更高的药效,对光稳定,适用于防治农业害虫,
For a long time, natural pyrethrin is an ideal insecticide for pest control, which has the advantages of high efficiency, quick knockdown, low toxicity and low residue. However, due to the production of pyrethrum chrysanthemum by the land, climate, cultivation conditions and labor constraints, the supply is not. In the late 1940s, the first synthetic pyrethroid allythrin was launched, opening up broad prospects for the development of pyrethroid insecticides. As many new pyrethroid varieties are successfully trial-and-error, their instability in light limits their application. In the early seventies, the United Kingdom M.Elliott synthesis of permethrin, cypermethrin and deltamethrin, and Japan N.ohno synthesis of cyanovalerate, they both maintain the characteristics of natural pyrethrins, while Higher efficacy, light stability, suitable for controlling agricultural pests,