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Japanese Maple Leaf Spot: Mancozeb or Bordeaux

Japanese Maple Leaf Spot: Mancozeb or Bordeaux

Purple eye leaf spot (1/4" circles, brown centers, purple margins) on Japanese red maple: common, little real damage. Control if desired.

Treatment

Mancozeb fungicide or Bordeaux mixture.
Start at bud break in early spring.
Repeat 7–10 days; 2–3 applications protect new growth.
Can spray now to protect emerging leaves.

Note

Disease cosmetic; many tolerate it. Follow label exactly.

Plant Diseases: Maple Anthracnose: Brown Veinal Discoloration—Cultural and Chemical Control; Phyllosticta Leaf Spot on Japanese Maple: Cosmetic Late-Season Fungus; Bark Peeling on Mature Japanese Maple: Sunscald or Something Else?; New Japanese Maple Brown Leaf Spots: Phyllosticta Leaf Spot; Japanese Maple Leaf Scorch and Transplant Shock: Same Symptoms, Different Causes; Saving a Large Japanese Maple with Bark Loss and Dead Branches; Japanese Maple Leaf Spots: Phyllosticta (Purple Eye); Japanese Maple Leaf Spots: Phyllosticta Leaf Spot Diagnosis and Management; Japanese Maple Leaf Spots: Phyllosticta Fungus — Mostly Cosmetic; Dog-Damaged Japanese Laceleaf Maple: Prune and Protect

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