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Disease Note.

First Report of Plumeria Rust, Caused by Coleosporium plumeriae, in Hawaii. D. Y. Ogata, Agricultural Diagnostic Service Center, Plant Disease Clinic, University of Hawaii at Manoa, Honolulu 96822. D. E. Gardner, National Park Service CPSU, Department of Botany, University of Hawaii at Manoa, Honolulu 96822. Plant Dis. 76:642. Accepted for publication 2 March 1992. Copyright 1992 The American Phytopathological Society. DOI: 10.1094/PD-76-0642B.

Plumeria rust, caused by Coleosporium plumeriae Pat. (= C. domingensis (Berk.) Arth.) (1), was first identified on Plumeria obtusa L. (Singapore plumeria) and several forms of P. rubra L. (red plumeria or frangipani) in Hawaii on the island of Oahu in January 1991. The rust has since been reported on the island of Kauai. C. plumeriae is known from tropical and SUbtropical regions of the Western Hemisphere, including southern Florida and Texas, where it defoliates ornamental P. rubra. P. obtusa shows tolerance to C. plumeriae in Hawaii, with only isolated pustules on leaves, whereas cultivars of P. rubra are severely attacked. Masses of powdery, chiefly hypophyllous, bright yellow-orange uredinia are conspicuous. Abundant darker yellow-orange, waxy-appearing telia are associated with uredinia in older infections. Small, angular chlorotic spots 2-3 mm in diameter are first produced on upper leaf surfaces, followed by leaf curling and drop, with defoliation sometimes approaching 100%.

Reference: (1) J. A. Traquair and E. G. Kokko. Can. J. Bot. 58:2454, 1980.