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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. |