沙冬青茎甲醇提取物对小菜蛾幼虫生长发育抑制作用研究

室内测定了沙冬青茎甲醇提取物对小菜蛾幼虫生长发育的抑制作用。研究结果表明,其提取物对小菜蛾幼虫相对生长率(RGR)、近似消化率(AD)、食物利用率(ECI)和食物转化率(ECD)虽在一段时间内连续发生变化,但最高浓度为0.2g/mL时,这4项指标始终低于其他处理。沙冬青茎甲醇提取物对小菜蛾幼虫历期的影响不明显,但使蛹期延长,幼虫死亡率升高,且提取物浓度越高,这些作用效果越明显。

Inhibitory effects of the methanol extracts from the caudices of Ammopiptanthus mongolicus on development of the larvae of the diamondback moth,Plutella xylostella

The inhibitory effects of the methanol extracts from the caudices of Ammopiptanthus mongolicus (Maxim. ex Kom.) Cheng f. on development of the larvae of the diamondback moth,Plutella xylostella L. were investigated in the laboratory by measuring the relative growth rate (RGR),approximate digestibility (AD),efficiency of conversion of ingested food (ECI),efficiency of conversion of digested food (ECD). The results indicated that the extracts could inhibit the growth of the larvae of the diamondback moth. Although the above-mentioned four parameters changed continually during the experiments,they were always lower at the highest concentration (0.2 g/mL) than at other concentrations. The duration of the larvae of diamondback moth was affected insignificantly,but the pupal stage was postponed and the mortality rate of larvae was raised by the extracts. Furthermore,the higher the concentration of the extracts,the more obvious the effects.