Fungal Leaf Scorch

Author: Paul Bertrand, University of Georgia

Symptoms

Fungal leaf scorch usually develops in late summer. The scorch (tissue browning and drying) begins at the leaflet margin and expands inward. There is a black or very dark brown band separating the scorched areas from the green portions of the leaflets. Scorched leaflets drop prematurely.

Disease Development

The exact cause of this disorder is unknown. Fungi are believed to be involved because they have been isolated from the scorched tissue and because fungicides have given some control of this disorder. Once fungal leaf scorch becomes obvious, there is little that can be done to control it. It is important to keep in mind that not all leaf scorch is fungal leaf scorch. Mites, nutritional disorders and dry weather all cause various kinds of pecan leaf scorch. If leaf scorch appears, it is important to determine the exact cause so that corrective measures, when available, can be taken.