Walnut Anthracnose

Informational table showing disease name, symptoms, pathogen/cause, and management of Walnut Anthracnose disease.
Walnut Anthracnose - Articles

Updated: August 14, 2017

Walnut Anthracnose
DiseaseSymptomsPathogen/CauseManagement
AnthracnoseCircular, brown spots with yellow halos form on the undersides of leaflets as the leaves reach full size. Leaflets yellow, brown, and fall prematurely, leaving trees very bare by August. Tiny, brown fungal fruiting structures form mostly along leaf veins on the undersides of leaves.Gnomonia leptostylaIt is thought that little actual damage occurs to the tree since most of the growth has occurred before the leaves fall. However, repeated severe defoliation gradually weakens the tree. Fertilize the tree well to maintain good vigor.

Prepared by Gary W. Moorman, Professor of Plant Pathology