用鄂尔多斯半日花(Helianthemum ordosicum)水煮膏配制不同浓度的溶液,采用微量点滴法研究其对小菜蛾幼虫的触杀活性,以叶片浸毒法研究其胃毒活性.结果表明,鄂尔多斯半日花水煮膏溶液对小菜蛾幼虫有很好的触杀和胃毒作用,经25g/L溶液处理,7d后的矫正死亡率均达到70%以上.
Toxicity of extract from Helianthemum ordosicum against larvae of Plutella xylostella was studied by micro topical application and stomach toxicity studied by leaf in poison. The results showed that extract of H. ordosicurn had toxicity to P. xylostella and the corrected mortality at 25 g/L is over 70 after seven days.