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Boston Ivy (Parthenocissus) Disease

Informational table showing disease name, symptoms, pathogen/cause, and management of Boston Ivy (Parthenocissus) diseases.
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Updated:
November 16, 2023
Boston Ivy (Parthenocissus) Disease
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
Leaf spots
Fungal fruiting structures within the spot
Fungal fruiting structures within the spot

Prepared by Gary W. Moorman, Professor emeritus of Plant Pathology

Gary W. Moorman, Ph.D.
Professor Emeritus
Pennsylvania State University
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