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The Nature of Control of Rhizoctonia solani by Pentachloronitrobenzene in Soil. W. H. Ko, Assistant Professor, Department of Plant Pathology, University of Hawaii, Hawaii Agricultural Experiment Station, Hilo; M. K. Oda, Former Senior, Hilo High School, Hilo, Hawaii 96720, Current address: Freshman, University of Hawaii, Hilo. Phytopathology 62:385-387. DOI: 10.1094/Phyto-62-385.

Beet seeds did not accumulate sufficient pentachloronitrobenzene (PCNB) from soil in 12 hr to protect them from infection by Rhizoctonia solani. The pathogenicity and population of R. solani in soil also were not affected by PCNB treatment. Direct microscopic observation of R. solani in soil indicates that control of R. solani by PCNB in soil is a consequence of strong suppression of growth of this fungus rather than destruction of it.