论文部分内容阅读
报道了青藏高原特有植物唐古特瑞香（Ｄａｐｈｎｅ ｔａｎｇｕｔｉｃａ）的杀虫作用。利用甲醇、丙酮、乙酸乙酯、氯仿、苯、石油醚６种极性不同的溶剂对唐古特瑞香进行了连续抽提，其中甲醇提取率最大，为２２．３％，石油醚的提取率最低为２.２１％．唐古特瑞香的甲醇、丙酮、乙酸乙酯、氯仿、苯抽提物对斜纹夜蛾３龄幼虫的 ＡＦＣ_(５０)值分别为以干粉计１０８． ７２、１１１.６９、１０２．１４、７１.７５、６５.５１ ｇ／Ｌ，石油醚抽提物在以干粉计 ５００ ｇ／Ｌ的浓度下，拒食率仅为 ６２．３１％．苯为拒食活性成分的最有效提取溶剂．
The insecticidal effect of Daphne tangutica, a endemic plant on the Qinghai-Tibet Plateau, was reported. The methanol, acetone, ethyl acetate, chloroform, benzene, petroleum ether six kinds of different polar solvents Tanggutuixiang continuous extraction, of which the largest methanol extraction rate of 22.3%, the lowest extraction rate of petroleum ether 2.21%. The AFC 50 values for the third instar larvae of S. litura were methanol, acetone, ethyl acetate, chloroform and benzene extracts of T. guttutum respectively as 108. 72,111.69,102.14,71.75,65.51 g / L, petroleum ether extract at a dry weight of 500 g / L, the anti-eating rate was only 62.31%. Benzene is the most effective anti-feeding active ingredient extraction solvent.