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棉红蜘蛛是棉花的主要害虫之一,我省棉区常年均有发生,尤其是干旱和综防不力的年份(地区)危害严重,对棉花生产威胁很大。在药剂使用上,由于长期使用有机磷杀虫剂,使致害虫的抗性日益增强,如用提高药液浓度和增加喷药次数去解决问题,势必增加棉农经济开支,而且还会招致农药“三大”公害。因此,选择高效、低毒、低残留、残效期长的新农药防治棉红蜘蛛具有非常重要的意义。一、材料与方法 20％三氯杀螨醇乳剂是河北沙城农药厂产品,它的化学名称为1,1一双(对氯苯基)-2·2·2-三氯乙醇,分子量370.5,溶于有机溶剂,遇碱分解。无内吸作用,以触杀为
Cotton spider mite is one of the main pests of cotton. The cotton area in our province has been occurring all the year round, especially in the areas where drought and ineffectiveness have been prevented in a long period of time, which poses a great threat to cotton production. In pharmaceutical use, due to the long-term use of organophosphate insecticides, pest resistance caused by increasing, such as increasing liquid concentration and increase the number of spraying to solve the problem, will inevitably increase cotton farmers economic expenditure, but also lead to pesticides “ Three ”public nuisance. Therefore, the selection of efficient, low toxicity, low residue, long residual effect of new pesticides to control cotton spider mites is of great significance. I. Materials and Methods 20% dicofol emulsion is a product of Shacheng Pesticide Factory in Hebei Province. Its chemical name is 1,1-bis (p-chlorophenyl) -2,2,2-trichloroethanol with a molecular weight of 370.5 and is soluble in organic solvents, Case of alkali decomposition. No suction to touch to kill