Occurrence of Glomerella cingulata in Pecan Nut Shucks and Its Association with Fungal Leaf Scorch. A. J. LATHAM, Department of Plant Pathology, Agricultural Experiment Station, Auburn University, AL 36849. K. L. BOWEN, and H. L. CAMPBELL, Department of Plant Pathology, Agricultural Experiment Station, Auburn University, AL 36849. Plant Dis. 79:182-185. Accepted for publication 17 November 1994. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1995. DOI: 10.1094/PD-79-0182.

Twenty-three pecan cultivars were tested for susceptibility to Glomerella cingulata. The incidence of G. cingulata from nut shucks ranged from 35.5% on Elliott to 94.0% on Cherokee. Isolation of G. cingulata from pecan leaves with fungal leaf scorch symptoms ranged from 36.9% on Desirable to 82.5% on Choctaw. Correlation coefficients from 1992 data indicated a positive and significant relationship (r = 0.92, P < 0.05), over cultivars, between the frequency of isolation of G. cingulata from pecan shucks with anthracnose and leaves with fungal leaf scorch symptoms. Typical symptoms of fungal leaf scorch were reproduced with G. cingulata on Schley pecan trees in the greenhouse.

Keyword(s): pecan diseases