Informational table showing disease name, symptoms, pathogen/cause, and management of Boston Ivy (Parthenocissus) diseases. Disease Symptoms Pathogen/Cause Management Leaf spot Angular, reddish to gray-brown spots enlarge and turn brown at the margins with tiny, black fungal fruiting bodies in the spots. Dieback occurs if the plant is severely infected. Guignardia bidwelli f. sp. parthenocissi Avoid overhead irrigation. Apply a fungicide before or soon after the plants have moisture on their leaves for 48 hours.

Leaf spots

Fungal fruiting structures within the spot

Prepared by Gary W. Moorman, Professor of Plant Pathology