Anthracnose (leaf blight) is a fungus that winters on twig tissue on the tree.

In the spring, spores are transported to new buds and shoots. The disease is enhanced by cool, wet conditions. infected leaves develop tan to reddish brown lesions that extend along the veins of the leaf. Considerable defoliation, sometimes with complete leaf loss, occurs on many trees by late spring in cool, wet years.

Different species of anthracnose impact a variety of tree species, including oak, ash, maple, elm, hickory, walnut, birch, linden, sycamore, and dogwood. Sycamore, white oak and dogwood are particularly susceptible to anthracnose.


The primary signs of anthracnose are tan to red-brown lesions that extend along the veins and edges of the leaf, as well as considerable defoliation, sometimes with complete leaf loss.

We recommend a trunk injection with a systemic fungicide such as propiconazole fungicide.

Propiconazole inhibits fungal cells while eliciting a plant health response from the tree. It promotes stronger, tree cells, root development, and triggers the tree is natural defense mechanisms making it more resistant to infection with quicker recovery time.

Propizol will have more direct and aggressive action against the fungus itself and is recommended if the infection is chronic or particularly severe.


Propiconazole may be trunkï injected in the fall prior to leaf drop or early spring prior to twig infection.

Propiconazole applied in the fall will slow the spread of infection the following spring and help the tree to grow leaves more normally.

Call us today for a consultation.

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