华北各省相传杀虫有效的“土药”很多,这些杀虫植物多产于山西省东南部的山野中,现在把我们初步试验的这几种药剂的效力分述如下:一、透骨草:又名毒蛆草,属透骨草科多年生植物分布在山西省长治专区黎城一带。一般生长在较阴的地方,高约一尺。每年谷雨出土,五月间开花,七月结实;据当地人说全株都有毒效。初步试验其杀虫效力是:喷药后四十八小时对菜粉蝶幼虫可死亡100 According to legend, all provinces of North China are insecticidally effective soil medicine, many of these insecticidal plants prolific in the mountains of southeastern Shanxi Province, and now our preliminary test of the effectiveness of these agents are described below: First, through the bone Grass: Also known as poison maggots grass, is a certainty perennial plants distribution in Changzhi area in Shanxi Province Li area. General growth in the more cloudy place, about a foot high. The valley rain is unearthed each year, blooming in May and firming in July. According to locals, the whole plant is toxic. The initial test insecticidal efficacy is: 48 hours after spraying cabbage butterfly larvae can die 100