为了观察广州市及海南岛一带所产的植物性土农药对孑孓的毒杀效力,我们于1958年12月和1959年5-8月先后作了药效测定。现将结果报告如下。材料和方法(一)试验幼虫及其来源:乏倦库蚊幼虫(以下简称孑孓):采自厕所清水化粪池及太平水缸,多为三龄。(二)试验药物及其来源:共试用药物25种28个部位。计:蓖麻叶,巴豆果,乌柏叶,野花椒子,辣蓼叶,牡荆叶,岗松,大叶按叶,小叶按叶,樟树 In order to observe the toxic effects of plant-based soil pesticides produced in Guangzhou and Hainan Island on the larvae, we measured the efficacy in December 1958 and May to August 1959. The results reported below. Materials and methods (1) Test larvae and their sources: Culex cunnifera larvae (hereinafter abbreviated as crickets): They are collected from toilets, clear water septic tanks and Taiping Water Tanks, mostly third-instar. (b) Test drugs and their sources: A total of 25 types of 28 drugs were tested. Gauge: Castor Leaf, Croton, Uber, Wild Chia Pepper, Spicy Alfalfa Leaves, Vitex Leaf, Gang-Song, Big-Leaf Leaf, Lobular Leaf, Eucalyptus