Rhizoctonia solani on White Lupine. S. S. Leach, Research Plant Pathologist, Agricultural Research Service, U.S. Department of Agriculture, N.E. Plant, Soil and Water Laboratory, Orono, ME 04469. W. M. Clapham, Research Leader, Agricultural Research Service, U.S. Department of Agriculture, N.E. Plant, Soil and Water Laboratory, Orono, ME 04469. Plant Dis. 76:417-419. Accepted for publication 26 October 1991. 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, 1992. DOI: 10.1094/PD-76-0417.

Rhizoctonia solani anastomosis group 5 (AG-5) was identified as a major pathogen of white lupine (Lupinus albus). The symptoms observed included reduced nodulation, seed rot, stem nipping, stem lesions, reduced root growth, and apical bud mortality. Terminal bud mortality has not been previously described on lupine. Strains of AG-5 hypovirulent on potato are nearly nonpathogenic on lupine. Strains of AG-1 and AG-4 also infected lupine but produced only very small stem lesions. Strains of AG-2 and AG-3 did not infect lupine.