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. 2017 Oct 10;8:1741. doi: 10.3389/fpls.2017.01741

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Copyright © 2017 Cruz, Luvisi, De Bellis and Ampatzidis.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Examples images of Olea europaea L. used in this study. (A) Healthy control (asymptomatic leaves); (B) OQDS-symptomatic leaves (Xylella fastidiosa-positive samples); (C) X. fastidiosa-negative samples showing another pathogen/disorder. Note that the images given here are the native, original aspect ratio of O. europaea L. leaves. It is easy to distinguish healthy leaves from non-healthy leaves (A vs. B or C). However, tissue desiccation on the leaf tip, if it occurs, is not exclusive to OQDS (C1, C4, and C6), thus it is challenging to detect the difference between OQDS and non-OQDS samples (B vs. C).