A comparison of the responses of Tetranychus urticae (Acari : Tetranychidae) and Phytoseiulus persimilis (Acari : Phytoseiidae) to volatiles emitted from lima bean leaves with different levels of damage made by T. urticae or Spodoptera exigua (Lepidoptera

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Volatiles from lima bean leaves heavily infested with the herbivorous spider mite, Tetranychus urticae, attracted thecarnivorous mite, Phytoseiulus persimilis, and repelled T urticae over volatilcs from uninfested leaves. Significantly more herbivore-induced volatilcs were emitted from heavily infested leaves than from slightly infested leaves. Whenleaves were moderately infested, the amount of induced volatilcs was intermediate between those of heavily infestedand slightly infested leaves. These volatilcs attracted P. persimilis, but neither attracted nor repelled T. urticae more than uninfested leaves. When leaves were slightly infested with T. urticae, small amounts of induced volatiles were detected. These volatiles neither attracted nor repelled P. persimilis more than uninfested leaves, but attracted T. urticae more than uninfested-leaf volatiles. The volatiles from lima bean leaves that were slightly or heavily infested with the herbivorous lepidopteran, Spodoptera exigua, neither attracted nor repelled T. urticae or P. persimilis. Most ofthe volatile compounds emitted from leaves heavily-infested with S. exigua were the same as those emitted from T. urticae-infestcd leaves, but the blend of the volatilcs differed with the infesting species. The functions of volatilcs emit-ted from herbivore-infested leaves are discussed in terms of herbivore density and their specificity.
日本応用動物昆虫学会の論文
2003-02-25