Brown leaf margins, leaf loss, slow decline in both species = unfavorable root environment: waterlogging, nutrient imbalance, or root-bound.
Not a pathogen. Fix the root zone, plants recover.
Bark Peeling and Leaf Spots on Young Maple: Decay Risk and Ants
Transplanting and Training a Young Maple Near House
Spider Mite Damage on Japanese Maple
Why Yellow Jackets Swarm Your Japanese Maple
Borers and Decay in Mature Silver Maple: Integrated Management
Transplanting a Maple Tree in Northern Arizona: Timing and Technique
Japanese Maple Honeydew and Sooty Mold: Aphid or Scale Infestation
Japanese Maple Scale Infestation: Simple WD-40 and Oil Treatment
Autumn Blaze Maple Borer Damage: Earwigs Secondary, Merit Treatment and Fertilization
Maple Tree Top Dieback: Root Competition and Mulch Solution
Japanese Maple Hypoxylon Canker: Fatal Fungal Diagnosis and Sanitation
Sycamore and Silver Maple Decline in Georgia Drought: Wait for Spring
Silver Maple Decline: Lawnmower Root Damage Leads to Rot and Lean
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