锡兰肉桂丙酮提取物对棉铃虫的毒力及其代谢酶活性的影响

采用叶片浸渍法和紫外分光光度法研究了锡兰肉桂Cinnamomum zexlanicum Nees丙酮提取物对棉铃虫Heliothis armigera (Hübner)的毒力及其代谢酶活性的影响，旨在为进一步深入了解锡兰肉桂的杀虫活性 及其在有害生物防治中的开发应用提供理论依据。试验结果表明，锡兰肉桂丙酮提取物对棉铃虫具有较强的毒杀作用，处理后72 h的LC50和LC95值分别为5.16 mg/mL和27.26 mg/mL，其13.33 mg/mL对棉铃虫的48 h和72 h校正死亡率分别为69.8%和80.2%，其6.67 mg/mL对棉铃虫的72 h校正死亡率为64.0%。锡兰肉桂丙酮提取物对棉铃虫酯酶、羧酸酯酶、酸性磷酸酯酶和碱性磷酸酯酶均具有明显的抑制作用，作用大小随处理浓度增加而增强。

The Toxicity of Cinnamomum zexlanicum Nees Acetone Extract and its Effects on Several Esterases in Heliothis armigera (Hübner)

The toxicity of acetone extract of Cinnamomum zexlanicum Nees and its effects on several esterases in Heliothis armigera (Hübner) were studied by leaf immersion method and ultraviolet spectrophotometry. The results showed that the acetone extract of C.zexlanicum had a good activity to H. armigera. The LC50 values and the LC95 values were 5.16 mg/mL and 27.26 mg/mL after 72 h of treatment; the corrected mortality were 69.8% and 80.2% after 48 h and 72 h of treatment at 13.33 mg/mL concentration and the corrected mortality was 64.0% after 72 h of treatment at 6.67 mg/mL concentration. The results also indicated that acetone extract of C. zexlanicum significantly inhibited esterase, carboxylesterase, alkaline phosphate esterase and acid phosphate esterase activities of H. armigera under various acetone extract concentrations of 5.0 ,4.0 ,3.0 ,2.0 and 1.0 μg/mL;the higher the treatment concentration, the heavier the inhibition.