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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Field disease symptoms of apple leaves. (A–C) represent the symptoms of leaf blight on the petiole, leaf front, and leaf back of ‘Fuji’. (D–F) represent the symptoms of leaf blight on the petiole, leaf front, and leaf back of ‘Golden Delicious’, respectively.