How to Treat Anthracnose in Sycamore Trees

Overview

Sycamores are common in North American landscapes but vulnerable to anthracnose, a fungal disease causing spring leaf wilting. Twigs and branches develop cankers that produce spores, reinfecting next spring. Wet, cool springs (below 55°F) worsen outbreaks. Diligent treatment helps.

Treatment Steps

Step 1: Apply Fungicide Early

Spray when buds swell in early spring. Re-treat for 1–2 weeks if rain follows application.

Step 2: Remove Fallen Debris

Collect and dispose of fallen leaves and twigs.

Step 3: Prune Infected Twigs

Cut off infected twigs remaining on tree. Discard them.

Step 4: Winter Watering

Water throughout winter (without snow) to prevent stress that increases disease susceptibility.