红脂大小蠹及油松挥发物对捕食性天敌寄主选择行为的影响

利用树木解剖及昆虫饲养选择的方法调查红脂大小蠹的捕食性天敌,发现一种鞘翅目颚甲科的昆虫为红脂大小蠹的天敌.利用Y-型嗅觉仪进一步研究发现健康油松挥发物、虫害油松挥发物及虫粪挥发物对该天敌昆虫都有显著的引诱作用,尤其对虫害油松挥发物趋向行为更强烈.该天敌昆虫在栖境定位和寄主选择过程中所利用的挥发物主要来自上述3类挥发物.4种单萜烯化合物对此种天敌昆虫的室内引诱实验发现,(S)-( )-3-蒈烯对天敌的引诱作用较为强烈.

Effect of Vola tiles from D endroc tonus va lens and P inus tabu laeform ison the Behav iora l Selection of Na tura l Enemy

The p redators of Red turpentine beetle (RTB ) , Dend roctonus valens were investigated by the method ofanatomizing of the p ine trunk and rearing choice test. One of p redator species of RTB ( Prostom is sp. ) was found inthe larval gallery. Behavioral response of this natural enemy to the volatiles emitted from healthy p ines ( Pinustabu laeform is) , RTB damaged p ines and fecal pellets of RTB were studied with a Y2tube olfactometer. The resultsshowed that natural enemieswere attracted to all the volatiles above, especially to that of damaged p ines. Volatilesfrom healthy p ines, RTB damaged p ines and fecal pellets of RTB could be used by the natural enemies to locate thehost habitat and to discriminate the p ines damaged from healthy ones. The p redator species of RTB ( Prostom is sp. )wasmore sensitive to ( S) -( + ) -3-Carene than three othermonoterpenes in the lab. experiment.