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The Safety and Efficacy of Fungicides for Use in Rhizoctonia Crown Rot Control of Directly Potted Unrooted Poinsettia Cuttings. C. C. Powell, Jr., Professor, Department of Plant Pathology, The Ohio State University, Columbus 43210. . Plant Dis. 72:693-695. Accepted for publication 5 February 1988. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0693.

Of quintozene, benomyl, and ethazole added as drenches to unrooted poinsettia (Euphorbia pulcherrima) cuttings, only benomyl controlled cutting rot caused by Rhizoctonia solani at rates that did not retard rooting. Quintozene and quintozene plus ethazole granular formulations incorporated into the potting medium before use also failed to control the disease except at rates that decreased rooting of the cuttings.

Keyword(s): fungus.