杠柳毒素NW的杀虫活性

杠柳毒素NW是从杠柳(Periploca sepium Bunge)中分离的新化合物,是其主要的杀虫成分。对杠柳毒素NW的杀虫活性进行了测定,结果表明:杠柳毒素NW对小地老虎无明显的胃毒活性,对3龄的小菜蛾、粘虫和菜粉蝶幼虫均有较强的胃毒活性,处理后24h的致死中浓(LC50)分别是866.17,927.92和1107.08mg·L-1;对上述供试昆虫均无明显的触杀活性。此外,杠柳毒素NW对棉蚜、棉红蜘蛛及卫生害虫家蝇3龄幼虫和淡色库蚊3龄幼虫均有很好的毒杀活性,处理后24h的LC50分别为1743.17,2179.49,714.94和653.29mg·L-1。

The insecticidal activity of periplocoside NW

Periplocoside NW(PNW)is one novel insecticidal compoound isolated from the root bark of Periploca sepium.The toxicity of PNW against some insect pests was investigated.Results showed that PNW had no obvious stomach poisoning activity to the third instar larvae of Agrotis ypsilon,but had strong stomach toxicity against third instar larvae of Plutella xylostell(LC_50 =866.17mg·L-1),Mythimna separata(LC_50=927.92 mg·L-1)and Pieris rapae(LC_50= 1 107.08 mg·L-1)after 24 hours.To the above insects species,PNW had no significant contact poisoning activity.In addition,PNW exhibited some lethal activity against Aphis gossypii(LC_50 =1743.17 mg·L-1),Tetranychus cinnarinus(LC_50 =2 179.49 mg·L-1),the third instar Musca domestica larvae(LC_50 =714.94 mg·L-1)and the third instar Culex pipiens pallens larvae(LC_50=653.29 mg·L-1)after 24 hours.