巴豆提取物对小菜蛾生物活性研究

摘要

The bioactivity of Croton tiglium ethanol extracts against Plutella xylostella L.were studied in the laboratory.The results showed that the extracts had strong antifeedant activity and growth inhibition activity against the larva,and oviposition inhibition activity against the adult of Plutella xylostella L.The bioactivity of Croton tiglium ethanol extracts against Plutella xylostella L.increased with the concentration of the extracts.The AFC50 (effective conc.causing 50 ％ antifeedant rate) and ACC50 (effective conc.causing 50 ％ growth inhibition rate) was 3.70 and 4.12 mg/mL,respectively.The AOC50 (effective conc.causing 50 ％ oviposition repellent rate) was (4.37 ± 0.37) mg/mL.The effect of ethand extract of Croton tiglium for contact toxic activity and stomach toxic activity against larvae of Plutella xylostella L.were not obvious.%室内测定了巴豆乙醇提取物对小菜蛾的生物活性.结果表明,巴豆乙醇提取物对小菜蛾幼虫有较强的拒食作用和生长抑制作用,对小菜蛾成虫有较强的产卵忌避作用.提取物浓度越高,作用效果越明显.巴豆乙醇提取物对小菜蛾幼虫的拒食中浓度(AFC50)和生长抑制中浓度(AGC50)分别为3.70和4.12 mg/mL.巴豆乙醇提取物对小菜蛾成虫产卵忌避中浓度(AOC50)为4.37mg/mL.巴豆乙醇提取物对小菜蛾幼虫触杀和胃毒作用不明显.