在内蒙古阿尔山的田间诱捕试验中,落叶松八齿小蠹引诱剂1共诱集到16头落叶松八齿小蠹和1 319头天敌红胸郭公虫,而落叶松八齿小蠹引诱剂2诱集到24 104头落叶松八齿小蠹和776头红胸郭公虫。室内的触角电位试验结果表明:落叶松八齿小蠹对引诱剂2的触角反应(雌虫2.139 mV±0.678 mV,雄虫2.169 mV±0.473 mV)大于引诱剂1(雌虫0.440 mV±0.232 mV,雄虫0.297 mV±0.142 mV),对引诱剂1的反应值和对照差不多;而红胸郭公虫对引诱剂1的触角反应(雌虫4.618 mV±1.106 mV,雄虫4.534 mV±1.087 mV)明显大于引诱剂2(雌虫2.209 mV±0.680 mV,雄虫1.953 mV±0.601 mV),对引诱剂2也有一定的反应值。触角电位试验与田间诱捕试验结果相符合。GC-MS分析结果表明:引诱剂1的主要成分为3.06%的cis-geraniol,1.98%的Ipsenol,80.36%的(S)-cis-verbenol 和1.03%的1-verbenone;结合卖方公司提供的数据,引诱剂1的主要成分为4.78%的2-methyl-3-buten-2-ol,63.71%的Ipsenol(纯度为96.9%),1.46%的Cedrene 和22.42%的Isocaryophillene。结合以上数据分析得出:不同成分引诱剂对落叶松八齿小蠹及天敌红胸郭公虫引诱能力显著不同,Ipsenol对诱集落叶松八齿小蠹起重要作用,而(S)-cis-verbenol则对诱集天敌红胸郭公虫起重要作用。
Field experiments conducted in Aershan forest area, Inner Mongolia, showed that Ipslure 1 attracted much more the clerid predator Thanasimus substriatus (1 319 individuals) than Ips subelongatus (16 individuals). On the contrary, Ipslure 2 attracted much more I. subelongatus (24 104 individuals) than its predators (776 individuals). The biological activities of the two ipslures were further evaluated using electroantennogram (EAG) recording with antennae from I. subelongatus and T. substriatus. The EAG amplitude of I. subelongatus to Ipslure 2 (2.139 mV±0.678 mV females, 2.169 mV±0.473 mV males) was much stronger than to Ipslure 1 (0.440 mV±0.232 mV females, 0.297 mV±0.142 mV males). In contrast, the response of T. substriatus to Ipslure 1 (4.618 mV±1.106 mV females, 4.534 mV±1.087 mV males) was much stronger than to Ipslure 2 (2.209 mV±0.680 mV females,1.953 mV±0.601 mV males). The EAG results were in agreement with those obtained from field experiments. Gas Chromatography-Mass Spectrometry (GC-MS) analyses showed that Ipslure 1 mainly cis-geraniol (3.06%), Ipsenol (1.98%), (S)-cis-verbenol (80.36%), 1-verbenone (1.03%) and Ipslure 2 consisted of 2-methyl-3-buten-2-ol (4.78%), Ipsenol (63.71%), Cedrene (1.46%) and isocaryophillene (22.42%). The ipsenol-dominant blend attracted a high number of I. subelongatus while the (S)-cis-verbenol-dominant blend attracted a high number of T. substriatus. The knowledge can be applied for population monitoring and biological control of I. subelongatus.
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