Abstract
Plants respond to herbivore attack by emitting a blend of volatiles called herbivore-induced plant volatiles (HIPVs), which attract arthropod natural enemies. Under natural conditions and multiple cropping agriculture systems, natural enemies are thought to encounter a mixture of HIPVs emanating from multiple plant species. The effect of such a mixture of HIPVs on the responses of natural enemies under field conditions has not been explored. Our study assessed whether a mixture of HIPVs from multiple host plant species influenced predator responses in field-cage conditions. We investigated (1) foraging behaviors of a predatory bug, Orius strigicollis, on cotton bollworm (Helicoverpa armigera) larvae-infested multiple host plant species, and (2) the attractiveness of a mixture of reconstituted HIPVs from multiple plant species to O. strigicollis in outdoor cages. Significantly, greater numbers of predators were attracted to H. armigera-infested multiple plant species. The predators exterminated significantly greater numbers of H. armigera larvae with the multiple versus single plant species treatments. Significantly, greater numbers of O. strigicollis were captured on traps baited with the mixture of reconstituted HIPVs from multiple versus single plant species. The enhanced attractiveness of a mixture of HIPVs from multiple plant species to O. strigicollis might be the result of an additive effect of HIPVs from the three plant species when combined in a mixture.
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We are very thankful to Arysta life Science Corporation (Tokyo) for providing the predator O. strigicollis for this research.
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Communicated by Livy Williams.
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Gebreziher, H.G., Nakamuta, K. A mixture of herbivore-induced plant volatiles from multiple host plant species enhances the attraction of a predatory bug under field-cage conditions. Arthropod-Plant Interactions 10, 507–515 (2016). https://doi.org/10.1007/s11829-016-9452-x
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DOI: https://doi.org/10.1007/s11829-016-9452-x