扁蓄对枸杞蚜虫杀虫活性的研究

[目的]研究扁蓄对枸杞蚜虫的杀虫活性。[方法]采用点滴法,测定了扁蓄乙醇提取物和石油醚、氯仿、乙酸乙酯、正丁醇和水几种不同极性萃取物对枸杞蚜虫的触杀活性。[结果]扁蓄提取物对枸杞蚜虫有较高的触杀活性,浓度为50.00 g/L时,48 h的校正死亡率达95.4%,毒力回归方程为:y=4.745 7+1.098x,LC50=1.707 g/L。几种萃取物对枸杞蚜虫的杀虫活性的顺序为石油醚>氯仿>正丁醇>乙酸乙酯>水,石油醚萃取物48 h的校正死亡率96.7%。[结论]扁蓄对枸杞蚜虫具有较强的触杀活性且杀虫活性物质为一类小极性的化合物。

Study on the Insecticidal Activity of the Extracts from Polygonum aviculare L. Against Wolfberry Aphids

[Objective] The research aimed to study the insecticidal activity of extracts from Polygonum aviculare L.against wolfberry aphids.[Method]The insecticidal activities of the ethanol extracts and 5 kinds of extracts with petroleum ether,chloroform,ethyl acetate,n-butanol,water from P.aviculare against wolfberry aphids were studied.[Result]The results showed that the extract displayed high contact activity to wolfberry aphids.The corrected mortality after 48 h reached 95.4 % under the concentration of 50.00 g/L and the regression equation of virulence was y=4.745 7+1.098x,LC50 =1.707 g/L.The insecticidal activities of 5 extracts against wolfberry aphids was in the order of petroleum ether > chloroform > n-butanol > ethyl acetate >water.The corrected mortality of petroleum ether extracts after 48 h was 96.7%.[Conclusion] P.aviculare had very high contact toxicity to wolfberry aphids.The insecticidal active substances were a kind of weak or non-polar compounds.