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

Three 35-yr maples in Illinois dropping leaves with brownish-black bumps. Phyllosticta leaf spot.

Details

• Circular tan spots, purple/red borders, black fruiting rings late season.
• Late infection = minimal damage.
• Fungicides only preventative in spring; not worth it on large trees.

Management

• Rake/destroy all fallen leaves this fall → reduces spores next year.
• No spray needed.

Bottom Line

Phyllosticta looks bad, doesn’t hurt tree. Rake leaves. Done.