Aphis craccivora Koch is a polyphagous and major pest of leguminous crops causing significant damage by reducing the yield. Repeated application of synthetic insecticides for the control of aphids has led to development of resistance. Therefore, the present study aimed to screen the insecticidal activity of root/stem extracts/fractions, and pure molecules from Cissampelos pareira Linnaeus against A. craccivora for identification of lead(s). Among root extract/fractions, the n-hexane fraction was found most effective (LC50 = 1828.19 mg/L) against A. craccivora, followed by parent extract (LC50 = 2211.54 mg/L). Among stem extract/fractions, the n-hexane fraction (LC50 = 1246.92 mg/L) was more effective than the water and n-butanol fractions. Based on GC and GC-MS analysis, among different compounds identified in the n-hexane fraction of root and stem, ethyl palmitate (known to possess insecticidal activity) was present in the highest concentration (24.94 to 52.95%) in both the fractions. Among pure molecules, pareirarineformate was found most effective (LC50 = 1491.93 mg/L) against A. craccivora, followed by cissamine (LC50 = 1556.31 mg/L). Parent extract and fractions of C. pareira possess promising activity against aphid. Further, field bio-efficacy studies are necessary to validate the current findings for the development of botanical formulation.
Aphis craccivora Koch是一种多食性和主要的豆科作物害虫,通过减少产量造成显著损害。反复使用合成杀虫剂来控制蚜虫已经导致了抗药性的产生。因此,本研究旨在筛选来自Cissampelos pareira Linnaeus的根/茎提取物/分馏物和纯分子的杀虫活性,以识别潜在的领先物质。在根提取物/分馏物中,正己烷分馏物对A. craccivora的效果最好(LC50 = 1828.19 mg/L),其次是母体提取物(LC50 = 2211.54 mg/L)。在茎提取物/分馏物中,正己烷分馏物(LC50 = 1246.92 mg/L)比水和正丁醇分馏物更有效。基于GC和GC-MS分析,在根和茎的正己烷分馏物中识别出的不同化合物中,乙酸乙酯(已知具有杀虫活性)在两个分馏物中的浓度最高(24.94至52.95%)。在纯分子中,pareirarineformate对A. craccivora的效果最好(LC50 = 1491.93 mg/L),其次是cissamine(LC50 = 1556.31 mg/L)。C. pareira的母体提取物和分馏物具有很好的杀虫活性。进一步的田间生物效力研究有必要验证当前的发现以开发植物制剂。