Dematiaceous Leaf Spots of Chrysalidocarpus lutescens and Other Palms in Florida. A. R. Chase, Assistant Professor of Plant Pathology, University of Florida Agricultural Research Center, Apopka 32703. Plant Dis. 66:697-699. Accepted for publication 27 October 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-697.

Leaf spot of Chrysalidocarpus lutescens (areca palm) was caused by Bipolaris (Helminthosporium) setariae, Exserohilum (Helminthosporium) rostratum, and Phaeotrichoconis crotalariae. No obvious differences in leaf spots incited by each organism through natural or artificial infection were noted. Caryota mitis (fishtail palm), Chamaedorea spp., and Rhapis excelsa (rhapis palm) were also susceptible to these pathogens, while several other palm species were resistant to one or more. The distribution and isolation record of these pathogens revealed that B. setariae and E. rostratum were most important and widely distributed in Florida.

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