The leaves of some birch trees may help deter herbivory by adsorbing arthropod-repelling chemical compounds emitted from neighboring plants.

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"Plant-emitted semi-volatile compounds have low vaporization rates at 20–25°C and may therefore persist on surfaces such as plant foliage. The passive adsorption of arthropod-repellent semi-volatiles to neighbouring foliage could convey associational resistance, whereby a plant's neighbours reduce damage caused by herbivores.

"We found that birch (Betula spp.) leaves adsorb and re-release the specific arthropod-repelling C15 semi-volatiles ledene, ledol and palustrol produced by Rhododendron tomentosum when grown in mixed association in a field setup

"In assessments for associational resistance, we found that the polyphagous green leaf weevils (Polydrusus flavipes) and autumnal moth (Epirrita autumnata) larvae both preferred B. pendula to R. tomentosum. P. flavipes also preferred birch leaves not exposed to R. tomentosum to leaves from mixed associations. In the field, a reduction in Euceraphis betulae aphid density occurred in mixed associations.

"Our results suggest that plant/tree species may be protected by semi-volatile compounds emitted by a more herbivore-resistant heterospecific neighbour." (Himanen et al. 2010:722)

Journal article

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Plants discover the benefits of good neighbors in strategy against herbivores.

Journal article
Himanen SJ; Blande JD; Klemola T; Pulkkinen J; Heijari J; Holopainen JK

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