【摘要】 为了开发新型、高效植物源农药,探讨蓼子朴作为植物源农药的可能性,笔者在室内测定了蓼子朴乙醇提取物对3龄小菜蛾幼虫的触杀、拒食、产卵忌避、胃毒、抑制生长发育5种生物活性作用。结果表明:蓼子朴乙醇提取物对小菜蛾3龄幼虫有较明显的触杀和拒食活性,校正死亡率和拒食率均随提取物浓度的升高而增大,浸渍法处理小菜蛾3龄幼虫72h的致死中浓度(LC50)为4.949g/L,24h的选择性、非选择性拒食中浓度(AFC50)分别为4.676、4.189g/L;乙醇提取物对小菜蛾的产卵忌避活性也很好,处理24h时的忌避效果达70%以上,对小菜蛾的忌避作用随施药后时间的延长而逐渐减弱;乙醇提取物对小菜蛾也有一定的胃毒、抑制生长发育活性。蓼子朴乙醇提取物对小菜蛾3龄幼虫具有较高的触杀和拒食生物活性,故蓼子朴具有潜在的植物源农药开发价值。更多还原

【Abstract】 In order to develop new and high effective plant pesticide,the possibility ofInula Salsoloides Ostenf.as botanical pesticide was investigated.Contacting toxicity,antifeeding,inhibiting oviposition,stomach poisoning and inhibiting growth and development of the ethanol extract fromInula Salsoloides Ostenf.against 3th instar larvae ofPlutella xylostella were determined in laboratory.The results indicated that the ethanol extract displayed obvious contacting toxicity and antifeeding effect against 3th instar larvae of Plutella xylostella.The corrected mortality and antifeedant rate both increased with the increasing of extract concentration.The LC50 of contacting action was 4.949 g/L by dipping method.The choice AFC50 and the non-choice AFC50 were respectively 4.676 g/L and 4.189 g/L at 24 h.The extract displayed good potentials of inhibiting oviposition.The repelling rate was more than 70% at 24 h.The repelling effect gradually decreased as the time increased.The extract also displayed stomach poisoning and inhibiting growth and development on Plutella xylostella.The study suggested that the ethanol extract fromInula Salsoloides Ostenf.had higher contacting toxicity and antifeeding against 3th instar larvae ofPlutella xylostella.Therefore,Inula Salsoloides Ostenf.had potential development value as plant pesticide.更多还原