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. 2014 Oct 24;9(10):e110919. doi: 10.1371/journal.pone.0110919

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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A, Clip cages used for confining adults of D. citri on xCitroncirus leaves. B–F, Epifluorescence micrographs showing stylet sheaths (ss) of D. citri in cross sections of the midrib in leaves of the relatively susceptible (Troyer-1459) plants. In B–F, the upper (adaxial) leaf side is up, and the lower (abaxial) side is down; unlabeled single arrows indicate smaller gaps in the fibrous ring; double arrows indicate wider gaps in this ring at the sides of the vascular bundle. Abbreviations: cc, central canal in the stylet sheath; co, core cells; fr, upper fibrous ring; frl, lower fibrous ring; gp, ground/spongy parenchyma; pc, palisade parenchyma cells; ph, upper phloem; phl, lower phloem; ss, stylet sheath; xy, upper xylem; xyl, lower xylem. Scale bars = 50 µm.