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Genetic Control of Pathogenicity in Rhizoctonia solani. N. A. Anderson, Professor, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108; H. M. Stretton, Research Assistant, Department of Plant Pathology, University of Adelaide, Waite Agricultural Research Station, Adelaide, South Australia. Phytopathology 68:1314-1317. Accepted for publication 18 April 1978. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1314.

Heterokaryons were synthesized among AG4 homokaryons of Rhizoctonia solani mutant for different stages of the infection process in flax hypocotyls. The heterokaryons were pathogenic and highly virulent. Pathogenicity of R. solani to flax hypocotyls is nonhost-specific and is controlled by several dominant factors. Two different genetic systems control seed rot and hypocotyl infection in the pathogen.