Cottonless Cottonwood Leaf Spots: Late-Season Fungus, No Treatment Needed

15-month-old cottonless cottonwoods near Houston have dark leaf spots and yellowing after heavy rain. Owner asks if it's a treatable disease.

Diagnosis

Leaf spot fungus favored by excessive rainfall. Late-season infection is cosmetic—trees are shutting down for fall.

Management

• No fungicide needed now.
• Rake and destroy fallen leaves to reduce spores next year.
• Consider it normal for cottonwoods.

Tree health unaffected.