Etiology and Control of Phytophthora Leaf Blight of Golden-Fruited Palm. N. M. Nagata, Department of Plant Pathology, University of Hawaii, Honolulu 96822. M. Aragaki, Department of Plant Pathology, University of Hawaii, Honolulu 96822. Plant Dis. 73:661-663. Accepted for publication 27 February 1989. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0661.

Necrotic brown flecks and rapidly, forming, large, angular to irregularly shaped leaf spots of Chrysalidocarpus lutescens (golden-fruited palm) were shown to be caused by Phytophthora nicotianae. The disease was confined to single outbreaks on the Hawaiian islands of Oahu and Kauai. Among Palmae tested, Pritchardia thurstonii, Ptychosperma macarthurii, Areca sp., Pinanga sp., and Thrinax sp. were susceptible to P. nicotianae. Metalaxyl and fosetyl-Al applied as either foliar sprays or drenches provided effective control of this disease in greenhouse tests.

Keyword(s): areca palm, Phytophthora parasitica.