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Influence of Host Plant and Isolate Source on Myrothecium Leaf Spot of Foliage Plants. A. R. Chase, Assistant Professor of Plant Pathology, University of Florida, Agricultural Research Center, Apopka 32703. Plant Dis. 67:668-671. Accepted for publication 29 November 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-668.

Myrothecium roridum isolates were pathogenic on Aeschynanthus pulcher, Aglaonema commutatum, Aphelandra squarrosa, Dieffenbachia maculata, Episcia cupreata, Fittonia verschaffeltii argyroneura, Hoya carnosa, Nematanthus sp., Peperomia spp., Pilea cadierei, and Spathiphyllum sp. ‘Clevelandii.’ Seven isolates of the pathogen from different hosts were cross-inoculated to seven of the original hosts. In general, some plant genera were more susceptible to all isolates, and some isolates were more virulent than others; however, there was no evidence of host specificity.

Keyword(s): crown rot.