Informational table showing disease name, symptoms, pathogen/cause, and management of Horsechestnut diseases. 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.

Prepared by Gary W. Moorman, Professor of Plant Pathology