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Web Blight of Rosemary Caused by Rhizoctonia solani AG-1. G. E. Holcomb, Professor, Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803. . Plant Dis. 76:859-860. Accepted for publication 31 March 1992. Copyright 1992 The American Phytopathological Society. DOI: 10.1094/PD-76-0859.

Web (aerial) blight of rosemary (Rosmarinus officinalis), characterized by twig and branch blight that results in decline and death of plants, was identified as being caused by Rhizoctonia solani AG-1. The disease was observed on large landscape plants of both prostrate and upright forms of rosemary, but only the prostrate form was killed. Disease control was obtained with benomyl, iprodione, and mancozeb in greenhouse tests. This is the first report of web blight of rosemary caused by R. solani.