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Grapevine rust Phakopsora euvitis is an important disease in tropical and subtropical grapevine-producing areas, and both American (Vitis labrusca) and European (Vitis vinifera) grapevine species are sensitive to rust. Grapevine rust can cause early plant defoliation, reducing photosynthesis and photoassimilate supply and storage. This study evaluated the photosynthetic damage induced by varying grapevine...