大蒜乙醇抽提物对烟蚜忌避及斜纹夜蛾拒食作用

Garlic ethanol-extract′s deterrent effect on Myzus persicae(sulzer) and anti-feeding effect on Spodoptera litura(Fabricius) for tobacco fields

为揭示大蒜抽提物的某些生物活性，在实验室进行了大蒜乙醇提取物对烟田有翅烟蚜的忌避作用及其对斜纹夜蛾3龄幼虫的拒食作用测定，结果表明：大蒜乙醇抽提物对有翅烟蚜有显著的忌避作用及其对斜纹夜蛾3龄幼虫也有显著的拒食作用。72h内，浓度为70g·L^-1、90g·L^-1大蒜乙醇抽提物对烟田有翅烟蚜的忌避作用较好，其忌避率在68．96％～100．00％之间；在该抽提物对斜纹夜蛾3龄幼虫的拒食作用测定中，24h内浓度为70g·L^-1、90g·L^-1大蒜乙醇抽提物的拒食效果较好，其拒食率在67．54％～96．74％之间。因此，可尝试以大蒜为原料研制植物保护剂来防治烟蚜和斜纹夜蛾。

The ethanol-extract of garlic （Allium sativum） was used in an indoor experiment to demonstrate its deterrent effect on Myzus persicae （sulzer） ,as well as the anti-feeding activity on Spodoptera litura （Fabricius）. Considerable deterrent and anti-feeding effects were found. Higher deterrent rates on M. persicae were 68. 96% to 100. 00% in 72 h when the extract concentration was 70 g L^-1 or 90 g L^-1. High anti-feeding rates on S. litura were 67.54% to 96.74% in 24 h when the extract concentration was 70 g L^-1 or 90 g L^-1. The results suggested that garlic＇s ethanol-extract could be applied to curb pest insect problems of M. persicae and S. litura in the tobacco fields.