1·The toxicity test indicated that of all 9 species of plant, the substances extracted from Chelidonium majus, Radix angelica dahurica , Pulsatillae Chinensis, Veratrum dah uricum Loes.
通过对林木害虫毒力测定结果表明：9种天然杀虫植物中白屈菜、兴安白芷、白头翁、兴安藜芦、白藓、走马芹粗提物杀虫效果较好。