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Rhizoctonia Blight on Waterhyacinth in the United States. T. E. Freeman, Professor, Plant Pathology Department, University of Florida, Gainesville 32611. R. Charudattan, Associate Professor, R. E. Cullen, Biologist, Plant Pathology Department, University of Florida, Gainesville 32611, and E. Addor, formerly Biologist, U.S. Army Corps of Engineers, Waterways Experiment Station, Vicksburg, MS 39180. Plant Dis. 66:861-862. Accepted for publication 12 March 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-861.

A foliar blight of waterhyacinth (Eichhornia crassipes) caused by the Rhizoctonia sp. stage of Aquathanatephorus pendulus was found occurring on plants collected at Butte Bayou in south central Louisiana. This fungus has previously been isolated from diseased waterhyacinth in the Canal Zone of Panama and in Puerto Rico. However, this is the first record of its occurrence in the United States.