One of 21 mountain apple trees with curled/wavy leaves = powdery mildew (Podosphaera leucotricha). Microclimate (shade, air flow) or slight genetic susceptibility makes that tree vulnerable.
Spray affected tree (and neighbors preventively) with Atomic Grow:
Fig Orchard Fungal Disease: Sanitation and Fungicide Strategy
Japanese Maple Transplant Shock and Leaf Scorch
Apple Tree Death Diagnosis and Fire Blight/Codling Moth Management for Home Orchard
New Mulberry Tree Leaf Death After Pruning: Transplant Shock or Stress
Cedar-Apple Rust on Apple Trees: Identification and Management
Diagnosing Apple Tree Fruit and Leaf Problems
Apple Tree Pruning: From Young Trees to Overgrown Restoration
Diagnosing Red Mounds on Ornamental Crabapple
Weeping Cherry Branch Dieback: Check Scale, Planting Depth, and Roots
Stopping Tree Sprouts After Cutting Down Crabapples
Treating Powdery Mildew on Apple Seedlings
Caring for Apple Seedlings: To Pinch or Not to Pinch?
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