Pest Alert – Anthracnose on Maple and Sycamore
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Antracnose leaf spot on sugar maple in late May.
There are many problems that can affect leaves of our native trees. Diseases such as anthracnose, powdery mildew, phyllosticta and bacterial scorch can infect tree leaves during favorable weather conditions. Lately, I have been getting lots of calls about browning leaves on maples and sycamores.
Anthracnose on sycamore can defoliate trees in years of high severity. However, this rarely harms the tree.
Anthracnose leaf spot is a broad term used for a variety of fungal diseases that infect hardwoods such as maple, sycamore, oak, ash, and dogwood. Anthracnose (caused by Aureobasidium apocryuptum, Discula campestris, Colletotrichum gleosporoides, and other fungal pathogens) causes lesions on leaves, twigs, and fruit. Lesions often have distinct margins and are located along leaf veins, where water may linger and promote fungal growth. They appear in the spring and expand as the leaf grows into the summer.
Powdery mildew on trees causes leaves to curl then turn purple. Eventually they get covered in white fungal mycelium resembling powder as in the case of this dogwood.
The symptoms of anthracnose can vary with the species of fungus and host. Anthracnose is primarily an aesthetic concern and does not impact established trees. No pesticides necessary! However, in rare cases, large infections and disease presence may kill young shoots and cause dieback. The most important management strategy is sanitation: removing infected fallen leaves can help prevent the spread of spores onto next year’s foliage.
Dogwood spot anthracnose can make dogwoods look terrible in the summer but really doesn’t harm the plant.
References: NC State Extension publication Common Diseases of Maples