Leaves described as "brown, like an X-ray" suggest severe necrosis or vascular failure—not mildew. The tissue is dead, but the tree may still be alive.
Examine where dead leaves attach to stems:
Plum Tree Shot Hole and Bark Bumps: Separating Insect Damage from Normal Lenticels
Japanese Maple Yellow Spots: Environmental Stress, Not Disease
Spindle Galls on Plum Leaves: A Cosmetic Issue
Southern Magnolia Excessive Leaf Drop: Check for Root Stress
Crepe Myrtle Yellow Leaves: Heat, Drought, or Nutrient Imbalance
Black Sooty Mold on Hackberry: Controlling the Aphids and Scale Behind It
Black Knot Disease on Prunus (Plum/Cherry): Hard Black Galls on Branches—Prune or Remove Tree
Dealing with Borers in Plum Trees: Identification and Treatment
Hydrangea Tree Yellowing and Leaf Drop: Water Stress, Not Spray Damage
Plum Tree Leaf Curl and Eggs: Beneficial vs. Pest Identification
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