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Variability in Virulence of Cylindrocladium crotalariae Isolates on Peanut. R. C. Rowe, Former Research Associate, Department of Plant Pathology, North Carolina State University, Raleigh 27607, Present address of senior author: Department of Plant Pathology, Ohio Agricultural Research and Development Center, Wooster 44691; M. K. Beute, Associate Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27607. Phytopathology 65:422-425. Accepted for publication 23 October 1974. DOI: 10.1094/Phyto-65-422.

A wide range of virulence was found in isolates of Cylindrocladium crotalariae collected from Virginia, North Carolina, South Carolina, Alabama and Hawaii. This variability was not related to linear growth rate in culture or to geographic origin of the isolates. The disease severity pattern on a series of six peanut varieties was essentially the same for all isolates tested, indicating the absence of detectable physiologic races in the fungus.