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黄药土名,学名叫雷公藤(Tribterygiumwilforolii),野生于南方各省,以浙江、江西、湖南产量最多。本品系落叶灌木。茎高3-4公尺。小枝呈暗红色,具有六棱的瘤状突起。叶长卵形,叶脉5-11条,叶互生,缘有锯齿。其根长而弯曲,深入土中。皮呈黄色,故名黄药。表面有纵皱皮及皮鳞,内质白紫色。新鲜时有青草样气味,干时不显。味苦而辛烈。药用部分为茎根之黄皮,或全株。本品则于昆虫,如松毛虫、蝗虫、鳞翅类之幼虫和多种鞘翅类昆虫、均有强烈毒性。据农民介绍,用于衣作物的手虫效力达95%以上。黄药根皮具有触杀和驱避作用,据我部应用以驱避作用较为显著,作用迅速。昆虫食少量黄药即昏迷,但事后能慢慢甦醒过来。根皮的药效胜于茎,
The name of the xanthate earthworm is Tribterygium wilforolii, which is wild in the southern provinces and has the highest yields in Zhejiang, Jiangxi, and Hunan. This is a deciduous shrub. Stem height 3-4 meters. Branchlets are dark red and have six-sided nodules. The leaves are long ovate, 5-11 leaf veins, leaves alternate, margins serrate. Its roots are long and curved, going deep into the earth. The skin is yellow, hence the name xanthate. The surface has wrinkled skin and scales, white and purple. When fresh, it smells like grass and it doesn’t show up when it’s dry. Bitter and intense. The medicinal part is the yellow skin of the stem root, or the whole plant. This product is highly toxic to insects such as pine caterpillars, aphids, lepidopterous larvae and many coleopteran insects. According to farmers, the efficacy of hand-worms used in clothing crops is over 95%. Xanthomae peel has contact and repellent effects. According to our department, the repellent effect is more pronounced and the effect is rapid. Insects eat a small amount of xanthate that is unconscious, but can slowly recover afterwards. The efficacy of root bark is better than stem,