Crown and Root Rot of Gloxinia and Other Gesneriads Caused by Phytophthora parasitica. Randy C. Ploetz, Assistant in Plant Pathology, IFAS, University of Florida, Agricultural Research & Education Center, Bradenton, FL 33508. Arthur W. Engelhard, Plant Pathologist, IFAS, University of Florida, Agricultural Research & Education Center, Bradenton, FL 33508. Plant Dis. 64:487-490. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-487.

Phytophthora parasitica incited a root and crown rot of the florist gloxinia. Subdue 5W was superior to Banrot 40W, Truban 30W, or Ortho 20615 50W in controlling the disease on the Improved Red Velvet and Improved Pink Velvet cultivars of gloxinia. Host range studies showed pathogenic variation among isolates of P. parasitica on gloxinia, African violet, and new hosts Episcia cupreata, Columnea gloriosa, and an unidentified species of Columnea.