How can I tell if my trees have Pecan Bacterial Leaf Scorch?

Randy S. Sanderlin, Bollich, Patricia A.  |  7/28/2006 9:02:21 PM

Pecan bacterial leaf scorch symptoms. Photograph by R. A. Melanson.

Symptoms of pecan bacterial leaf scorch begin with leaflets becoming brown or tan at the tips and/or margins and progressing towards the midrib and base of the leaflets. The affected leaflets drop from the leaf stem (rachis) shortly after onset of symptoms. Often the leaflets on one side of a compound leaf develop symptoms before the other side, which can result in a leaf that has lost leaflets on only one side. These symptoms may be limited to one or more major limbs or may be present throughout the tree. Symptoms begin to become obvious in mid-summer and tend to increase through fall. Other pests or problems, such as scorch mites or nutritional deficiencies, can cause similar symptoms. The most distinguishing symptom of bacterial leaf scorch is a smooth, unbroken pattern of dying leaflet tissue from the tip and leaflet margins, not blotches or spots that may coalesce.

For more information on Pecan Bacterial Leaf Scorch, please see the Pecan Bacterial Leaf Scorch publication on the Plant Pathology page of the Pecan Station website.

Question answered by Dr. Randy Sanderlin, Pecan Research-Extension Station plant pathologist.

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