Conditioned olfactory responses of a predatory mite, Neoseiulus womersleyi, to volatiles from prey-infested plants
2006
Maeda, Taro | Liu, Yining | Ishiwari, Hayato | Shimoda, Takeshi
To clarify the prey-finding behavior of the predatory mite Neoseiulus womersleyi (Schicha) (Acari: Phytoseiidae), we studied its olfactory responses to volatiles from the prey-infested plant on which the mites had been collected. We used a local N. womersleyi population called Kanaya collected from tea (Camellia sinensis L.) (Theaceae) plants infested by Tetranychus kanzawai Kishida (Acari: Tetranychidae) in Kanaya City, Japan. Neoseiulus womersleyi (Kanaya population) were more attracted to volatiles from tea plants infested with five female T. kanzawai per leaf for 7 days than to intact tea leaves in a Y-tube olfactometer. Tetranychus kanzawai-induced tea leaf volatiles were identified as (E)-β-ocimene, (E)-4,8-dimethyl-1,3,7-nonatriene, and (E,E)-α-farnesene. As olfactory responses are known to differ among local populations of N. womersleyi, we compared the responses of the Kanaya population with those of a Kikugawa population collected from tea plants infested by T. kanzawai in Kikugawa City. To test the influence of previous predation experience, we reared the two populations on tea plants infested by T. kanzawai or on kidney bean plants (Phaseolus vulgaris) infested by Tetranychus urticae Koch. The Kanaya population was more attracted to the volatiles from infested plants on which they had been reared. Because the Kanaya population was not attracted to the plant volatiles they had not previously experienced, the positive response to previously experienced volatiles might be the result of learning. By contrast, the Kikugawa population showed no preference for previously experienced volatiles from infested plants. The implications of this flexibility in foraging behavior are discussed.
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