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Immunological Comparison of Isolates of Verticillium albo-atrum and V. nigrescens Pathogenic to Cotton. T. D. Wyllie, Associate Professor, Department of Plant Pathology, University of Missouri, Columbia 65201; J. E. DeVay, Professor, Department of Plant Pathology, University of California, Davis 95616. Phytopathology 60:1682-1686. Accepted for publication 29 June 1970. DOI: 10.1094/Phyto-60-1682.

Serological and electrophoretic comparisons were made of cotton defoliating and nondefoliating pathogenic isolates of Verticillium albo-atrum from California and Missouri. A similar comparison was made with V. nigrescens isolates mildly virulent on cotton. The Verticillium spp. were distinctly differentiated from one another on an antigenic basis. The non-defoliating strain of V. albo-atrum SS4 was shown to differ antigenically from the defoliating strain T9; it appeared to be more closely related serologically to the mildly virulent V. nigrescens isolates than was the defoliating T9 isolate.

Additional keywords: Root pathogen, wilt.