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Maple Leaf Warts and Holes: Phyllosticta Leaf Spot

Circular Tan Spots with Red Borders on Maple? Phyllosticta Leaf Spot

Late-season infection causes minimal harm. Spots have purple-red borders, later black fruiting rings. Fungicides (mancozeb, chlorothalonil) applied early spring can prevent. Rake fallen leaves.

Plant Diseases: Red Bumps on One Maple Only: Insect Galls, Not Disease; Bark Peeling and Leaf Spots on Young Maple: Decay Risk and Ants; Phyllosticta Leaf Spot on Japanese Maple: Cosmetic Late-Season Fungus; Silver Maple Base Sprouts Only: Root Stress and Canopy Loss; Maple Trunk White Spots: Harmless Lichens; Phyllosticta Leaf Spot on Maple: The 'Lunar Eclipse' Fungus; Maple Leaf Spot: Phyllosticta—Mostly Cosmetic; Phyllosticta Leaf Spot on Young Maple; Maple Leaf Spot: Phyllosticta Diagnosis and Management; Red Bumps on Autumn Blaze Maple: Leaf Spot or Gall?

Garden Articles

Identifying Lichen vs. Disease on Maple Trunks and Managing Frost Cracks

Black Spots on Japanese Maple Bark: Likely Harmless Lichens

Black Spots on Maple Leaves: Tar Spot Fungus—Rake Leaves, Reduce Inoculum, Tree Usually Fine

Maple Leaf Spots: Phyllosticta—Rake Leaves, Don't Spray

Maple Tree White Spots and Leaf Eaters: Lichen and Insect Control

Managing Fungal Leaf Spots on Tabebuia Trees

Maple Tree Fall Color: 'Legacy' Sugar Maple or 'Autumn Blaze'

Plants

Maple 'October Glory' Leaf Spots: Phyllosticta Fungus

Mature Maple Tar Spot: Management and Fertilization

White Spots on Oak Leaves: Likely Powdery Mildew

White Powdery Spots on Maple Leaf Undersides: Likely Insects

White Spots on Red Maple: Superficial Fungus/Algae, Not Harmful

Brown Spots on Maple Leaves: Phyllosticta Leaf Spot

New Japanese Maple Brown Leaf Spots: Phyllosticta Leaf Spot