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蚊幼虫对DDT、666已产生了较高的抗药性,此点国内早有报道(俞渊等,1963;吴能等;1964;刘维德等,1964)。1973年以来我市北戴河区改用双硫磷杀灭蚊幼虫取得了很好效果,优点是对高等动物毒性低,对蚊幼虫击倒速度快,残效时间较长,用药量省,对天敌如蜻蜒幼虫、蝌蚪、青蛙以及各种鱼类等均无影响,确实是比较理想的杀蚊幼虫药剂(秦皇岛市卫生防疫站等,1974)。但蚊幼虫孳生地十分复杂,不同类型孳生地用什么方法施药才能延长残效时间、提高杀虫效果,又能节省人力物力,确实是个值得研究的问题。寻找
Mosquito larvae DDT, 666 has produced a higher resistance, this point has long been reported in China (Yu Yuan et al., 1963; Wuneng et al; 1964; Liu Weide et al., 1964). Since 1973, the city of Beidaihe to diphtheria to kill mosquito larvae achieved good results, the advantage of lower toxicity to higher animals, mosquito larvae knockdown speed, the residual effect of a long time, the amount of medication, the natural enemies such as Ophiopogon larvae, tadpoles, frogs and various kinds of fish have no effect and are indeed ideal mosquito larvae agents (Qinhuangdao Municipal Health and Epidemic Prevention Station, etc., 1974). However, mosquito larvae breeding ground is very complicated, different types of breeding places by what method of application of pesticides in order to extend the residual time, improve insecticidal effect, but also save manpower and resources, is indeed a worthy of study. Look for