辣椒碱对枸杞蚜虫的毒性研究

Study on Virulence of Capsaicine against Medlar Aphids

[目的]研究辣椒碱对枸杞蚜虫的杀虫活性。[方法]采用载毒叶片法室内测定辣椒碱12.5、25.0、37.5、50.0、62.5mg/L5个浓度系列对枸杞蚜虫的毒力。[结果]随着浓度的增大,辣椒碱的杀虫活性显著增强,在浓度为12.5mg/L时枸杞蚜虫死亡率达到66.7%,当浓度为62.5mg/L时,试虫全部死亡。毒力回归结果表明,其LC50为13.21mg/L。说明辣椒碱具有良好的防除枸杞蚜虫的作用,可代替目前所使用的毒性大、残留量高的有机磷、除虫菊酯类化学农药。[结论]该研究为辣椒碱作为新型绿色农药,防治枸杞蚜虫提供了理论依据。

[Objective]The study aimed to research the insecticidal activity of capsaicine against the medlar aphids.[Method]The load poison blade method indoor was used to determine the virulence of capsaicin at 5 concn.series of 12.5,25.0,37.5,50.0 and 62.5 mg/L against the medlar aphids in the lab.[Result]Along with the increase of capsaicin concn.,the insecticidal activity of the capsaicin was enhanced markedly.When the capsaicin was 12.5 mg/L the mortality of medlar aphids reached to 66.7%,and when capsaicin was 62.5 mg/L the medlar aphids were all in death.Virulence regression results showed that the LC50 for capsaicin was 13.21 mg/L,explaining that the capsaicin had the good control action on the medlar aphids,so it could be instead of the current-used organophosphate and pyrethrins chemical pesticides with great toxic and high residue.[Conclusion]This research provided a theoretical basis for the capsaicin as new green pesticide to control the medlar aphids