Fruitless Mulberry Leaf Spot: Late-Season Fungus Management

Yellow Leaves with Black Spots on Mulberry in Fall? Likely Leaf Spot Fungus

Leaf spot fungi (e.g., Cercospora, Phyllosticta) cause yellowing and black spots on mulberry in late summer/fall. Since the tree is preparing for dormancy, treatment is rarely needed.

Fall Management

• Rake and destroy fallen leaves to reduce overwintering spores.
• Do not spray fungicide now—ineffective and unnecessary.

Spring Prevention

• Apply copper-based fungicide or chlorothalonil at bud break and again 2 weeks later.
• Ensure good air circulation via pruning.
• Avoid overhead irrigation.

Outlook

Leaf spot is cosmetic; it won't kill the tree. Consistent sanitation breaks the disease cycle.