The actual emission rates and their relative ratios of multi-component pheromone blend of the normal and mutant cabbage looper moth from rubber septa were determined by analyzing the extracts of airborne collection in Gas Chromatography-Mass Spectrometry. Dodecyl and dodecenyl acetates emitted significantly faster than tetradecenyl acetates from the septum containing these two groups of acetates at equal amounts. The emission rate increased with the increase of loading dosage, but reach its maximum at 100 μg. Emission rates of all pheromone components decreased dramatically after baits were exposed for one week. Frozen-stored pheromone baits decreased their emission rates of pheromone compounds starting from the second day, conpared to those of fresh ones. There was no increase in male behavioral response of male mutants towards the elevated mutant pheromone bait, which was equivalent to what a mutant female produced. But the normal nale cabbage looper moths do prefer to the pheromone bait emitted less amount of Z9-14:OAc. The influence of release rates on mating disruption was also discussed.%用空气收集法收集样品,用气相色谱-质谱联用仪分析了正常与变异的粉纹夜蛾Trichoplusia ni品系的多元性信息素组份的相对比例及其混合物在硅胶诱芯上的精确释放速率.在剂量相同的情况下,十二烷基醋酸酯(Dodecyl acetate)和十二碳烯基醋酸酯(Dodecenyl acetate)从诱芯中散发的速率要比十四碳烯基醋酸酯(Tetradecenyl acetate)高得多.当诱芯中性信息素的含量低于100μg时,各组份的释放速率与剂量成正比.诱芯置于空气中一星期之后,所有组份的释放速率均剧烈下降.与刚配制的诱芯相比,冷藏诱芯中的性信息素的释放速率从第二天起即开始下降.增加诱芯中雌性信息素(由变异雌蛾所产生)的剂量并不能加强变异雄蛾的行为反应.正常雄蛾对于Z9-十四碳烯基醋酸酯(Z9-14:OAc)释放率较低的诱芯,表现出更强的选择性.本文也讨论了释放速率对交配干扰的影响.
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