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Horsechestnut Disease

Informational table showing disease name, symptoms, pathogen/cause, and management of Horsechestnut diseases.
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Updated:
November 15, 2023
Horsechestnut Disease
Disease Symptoms Pathogen/Cause Management
Leaf Blotch Small irregular, reddish-brown spots and large blotches with yellow halos form in late June or early July. Most infected leaves brown and fall prematurely. Tiny, black fruiting structures are found in the dead areas. Guignardia aesculi For trees of high value, apply a fungicide in early summer.

A horsechestnut leaf with five leaflets. There are several irregular, reddish-brown blotches with yellow margins on the leaflets.

A horsechestnut leaf with brown and yellow blotches on the leaflets. The margin of the leaflets is rolled slightly inward.

A medium horsechestnut tree is viewed from the side and shows part of the tree\'s canopy. Many of the leaves have brown tissue from leaf blotch disease and from a distance it looks brown and unhealthy

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

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