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. 2019 Aug 1;9:11161. doi: 10.1038/s41598-019-47562-1

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Scheme of the experimental apparatus of the diaphragm cell: (a) magnetic stirring bar, (b) liquid phase (eugenol or clove essential oil), (c) headspace of the Büchner flask with the volatile phase, (d) lateral opening of the Büchner flask sealed with a rubber septum for sampling of the volatile phase, (e) cages with grain and insects used for the bioassays, (f) rubber septum for sampling of the volatile phase after passing through the column of grain, (g) the bottom chamber of the prototype, (h) ball valve connecting the parts of the system, and (i) upper chamber of the prototype.