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Overview of sampled trees. (a) Sampling in March 2016 (site 1), (b) Sampling in November 2016 (site 2). Tree labels indicate species affiliation (H = holm oak, C = cork oak) and a health status class (I = healthy trees with 100%–95% foliation; II = trees of an intermediate health and a foliation of 94%–80%; III = diseased trees with crown foliation of 79%–50%, and IV = severely diseased or dead trees with 49%–0% foliation) (Satellite imagery © 2017 Google Earth)
