【摘要】 <正> DDT,666,Chlordan及Toxaphene为最常用之四种氯化烃类杀虫药。此四种杀虫药之毒性在各种昆虫上已有许多比较毒性之研究。Kulash(1,2)以马铃薯甲虫(Leptinotarsa decemlineata)及棉象鼻虫(Anthonomus grandis)为试验,比较666,DDT及Chlordan三者之效力,其结论为;各种DDT类似物除去op’同分异构体外,效力皆极好,Chlordan效力亦好,但不优於DDT,而666则为三者之间最有效者。Gould(3)以此四种杀虫药试验於蟑螂(Blatella germanica)上,更多还原

【Abstract】 1. All four insecticides are practically non-toxic,to the eggs of elm leafbeetle, indicating that they are not ovicides. The reduction of the numberof insects however is due to the residual toxic action of these chemicals onthe newly-hatched larvae. 2. All four insecticides kill the larvae, pupae and adults effectively. Forthe larvae, the mature larvae are more resi stant than the young ones and thenewly-hatched larvae are most sensitive to the toxic action of these chemicals. 3. For the comparative toxicity of the four insecticides, they are almostequal toward the adults, with gammexane slightly more preferable. Forlarvae, DDT is in no way inferior to Gammexane, and both are more effectivethan Chlordan and Toxaphene; Chlordan being the least effective. For pupae,DDT, Gammexana and Toxaphene are about equal and are all better thanChlordan. The order of decreasing toxicity in general is: DDT=Gammexane>Toxaphene>Chlordan更多还原