Sycamre Tree Leaf Diseases

Leaf Diseases & Sycamore Trees

Sycamore trees are large, attractive, shade trees commonly planted on commercial and residential properties. The two most common leaf diseases affecting sycamore trees in our area are anthracnose fungus and powdery mildew.


Anthracnose on Sycamore TreesAnthracnose fungus appears in early spring right after the leaves come out. The leaves get blotchy, angular necrotic lesions, often along leaf vein margins. As the disease progresses, the leaves brown and curl, usually dropping from the tree prematurely. The disease causes stress, and makes the large beautiful leaves less attractive, but will not kill the tree

Powdery Mildew:

powdery mildewPowdery mildew usually appears in late summer. The leaves become covered with a white fungal mycelia mat (looking like a white powder).


We recommend trunk injections of systemic fungicides to control the diseases. The injection program should be started in late summer the first year, followed by biannual injections in the spring and summer for subsequent years.

If you suspect your Sycamore trees have either disease, contact an ISA Certified Arborist from Cagwin & Dorward to inspect your trees.

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