Comparative repellency effect of three plant extracts on Paederus beetles(Coleoptera: Staphylinidae), the cause of linear dermatitis in Iran

Objective: To investigate the repellent effect of neem, juniper and eucalyptus extracts as a form of protection against Paederus beetles, which are a cause of linear dermatitis in Iran.Methods: After collecting and extracting plant samples, the extracts were tested on Paederus beetles in three concentrations(2.5%, 5.0% and 10.0%) with direct method under laboratory conditions. The data were analyzed using SPSS software(version 20).Results: The results indicated that there was a significant difference between neem with juniper and eucalyptus at the 2.5% and 5.0% concentrations(P < 0.05), whereas there was a significant difference between all three extracts at the 10.0% concentration(P < 0.05).Conclusions: This is the first report on the repellent effect of these three plant extracts on Paederus beetles. Neem oil appeared to have the largest effect on Paederus spp. and juniper essential oil exhibited the second highest repellency, followed by eucalyptus.

梭毒隐翅虫脂溶性成分的气相色谱-质谱联用分析

采用氯仿为溶剂超声辅助提取梭毒隐翅虫(Paederus fuscipes Curtis)的脂溶性成分,并采用气相色谱-质谱联用技术对其进行了分析鉴定。结果共检出92种脂溶性成分,并鉴定出其中的48种,可鉴定成分相对百分含量之和达到83.41%,其中相对百分含量较高的有(Z)-13-二十二酰胺(12.79%)、二十四烷(9.13%)、二十八烷(8.76%)、油酸乙酯(8.06%)、(Z)-9-十八烯酰胺(5.57%)。

青翅蚁形隐翅虫对菜粉蝶卵的捕食作用

研究了不同猎物虫态、不同猎物密度、不同捕食者密度、不同温度下青翅蚁形隐翅虫(Paederus fusci-pesCurtis)对菜粉蝶(Pieris rapaeLinnaeus)卵捕食作用的影响。结果表明:1)青翅蚁形隐翅虫对菜粉蝶卵的捕食能力显著高于其低龄幼虫;2)不同猎物密度下的捕食功能反应符合HollingⅡ型方程,其方程为Na=1.031 8N/(1+0.016 9N),寻找效应则随着猎物密度的增加而减少;3)青翅蚁形隐翅虫干扰反应模型为E=0.595 3P-0.690 2,随着捕食者密度的增大,平均捕食量逐渐减少;4)不同温度下的捕食量以25~30℃时最高。