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Plum leaf problem - Ask Extension

My nephew in Circle Pines, MN, has this on his plum tree leaves. Is it a fungus? Can you identify it, and if so, recommend a treatment.

This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.