Do plants use airborne cues to recognize herbivores on their neighbours?

@article{Choh2012DoPU,
  title={Do plants use airborne cues to recognize herbivores on their neighbours?},
  author={Yasuyuki Choh and Rika Ozawa and Junji Takabayashi},
  journal={Experimental and Applied Acarology},
  year={2012},
  volume={59},
  pages={263 - 273}
}
Plants show defensive responses after exposure to volatiles from neighbouring plants infested by herbivores. When a plant’s neighbours host only species of herbivores that do not feed on the plant itself, the plant can conserve energy by maintaining a low defence level. An intriguing question is whether plants respond differently to volatiles from plants infested by herbivores that pose greater or lesser degrees of danger. We examined the secretion of extrafloral nectar (EFN) in lima bean… 

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