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Colonization of Host Tissues and Infectivity of Rhizoctonia solani. H. L. Warren, Research Plant Pathologist, ARS, USDA, Purdue University, West Lafayette, Indiana 47907; Phytopathology 63:1024-1027. Accepted for publication 16 February 1973. DOI: 10.1094/Phyto-63-1024.

Saprophytic colonization of various host tissues by Rhizoctonia solani and their influence on hypocotyl rot of lima beans was studied. Leaf tissue was the most suitable substrate for colonization by R. solani, whereas root tissue was least susceptible. Soil amended with lima bean leaf tissue gave the highest disease index on lima bean hypocotyls and permitted the highest percentage of beet seeds to be colonized. Soil amended with root segments gave a lower disease rating on lima bean hypocotyls than the control, but did not alter colonization of the beet seeds.

Additional keywords: Phaseolus lunatus, saprophytic growth.