二氧化碳对三种蛴螬的引诱作用

Attractiveness of carbon dioxide to white grub(Coleoptera:Scarabaeoidea)

本研究通过测定二氧化碳对蛴螬的吸引力为地下害虫的防治提供参考。试验采用＂Y＂形嗅觉仪测定3种常见蛴螬对不同浓度二氧化碳的趋向行为,并以最趋二氧化碳浓度测试蛴螬在寄主存在环境下的选择行为。结果表明,蛴螬对二氧化碳有明显的趋向性,取食习性影响蛴螬对二氧化碳的趋性行为,植食性的暗黑鳃金龟幼虫对3%～15%低浓度范围的二氧化碳具有较好趋向性,同样为植食性的铜绿丽金龟幼虫也趋向浓度较低的二氧化碳,腐食性的白星花金龟幼虫不仅对70%高浓度的二氧化碳具有显著趋向性,而且对较低浓度的二氧化碳有趋向性。有花生根存在的背景环境下,二氧化碳的引诱力减弱,对寄主植物的选择更为显著。

This study aimed to provide new insights for underground pest control by analyzing the attractiveness of CO_2 to the white grub.Y-tube olfactometer tests were conducted to investigate taxis responses of white grub to different concentrations of CO_2 and the optimal concentration versus peanut plants.The results indicated that larvae are significantly attracted to CO_2;the feeding habits influenced the attractiveness of CO_2 to phytophagous larvae of H.parallela,which were more attracted to lower concentration in the range of 3%-15% CO_2,and so did the Anomala corpulentalarvae,in the range of 1%-3%,but 70% CO_2 could attract Protaetia brevitarsis larvae as the saprophagous pests.However,CO_2 was a weak attractant to white grub larvae in the presence of peanut root systems.