Sycamore Anthracnose

Sycamore anthracnose causes leaf spotting and defoliation on sycamores and European maple, with symptoms most severe following cool, wet springs in the Puget Sound. You'll notice brown patches on expanding leaves, sometimes with a target or concentric pattern, and affected leaves may drop prematurely. The disease can affect new shoots and twigs as well, creating a blighted appearance on developing growth.

Healthy trees tolerate anthracnose better than stressed ones, so your management goal is keeping trees vigorous. Rake and destroy fallen leaves to reduce overwintering fungal structures, and consider planting resistant varieties like Bloodgood plane tree or the oriental hybrid cultivars Columbia and Liberty if anthracnose has been a consistent problem on your property. Cultural care, good drainage, and proper pruning will help trees recover from leaf loss faster.