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Disease Note.

Recent Occurrence of Pecan Anthracnose Caused by Glomerella cingulata.. T. B. Brenneman, Department of Plant Pathology, Coastal Plain Station, University of Georgia, Tifton 31793. C. C. Reilly, USDA-ARS/SE, Fruit-Nut Research Laboratory, Byron, GA 31008. Plant Dis. 73:775. Accepted for publication 12 June 1989. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0775D.

Anthracnose of pecan (Carya illinoinensis (Wang.) K. Koch) caused by Glomerella cingulata (Ston.) Spauld. & Schrenk was first reported in the United States in 1914 (1) but has not been a problem. Recently, the disease caused significant losses in Georgia. Symptoms were originally reported on shucks and leaves, but we observed symptoms only on shucks. Distinct black lesions developed late in the season (after nut expansion) near the proximal end of otherwise healthy nuts. Lesions often were initiated at wounds where adjacent nuts in a cluster are in contact or along a shuck suture. The fungus colonizes the shuck and may penetrate the shell and kernel, resulting in decreased kernel development or shucks clinging to the shell at maturity. Typical symptoms were reproduced by inoculating nut clusters in the laboratory, and the fungus was readily reisolated. The cultivars Wichita, Van Deman, Schley, and Grabohl showed symptoms in the field.

Reference: (1) F. V. Rand. J. Agric. Res. 1:303, 1914.