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Susceptibility of Pineapple Cultivars to Fruit Diseases Incited by Penicillium funiculosum and Fusarium moniliforme. K. G. Rohrbach, Associate Plant Pathologist, Department of Plant Pathology, University of Hawaii, Honolulu, HI 96822; J. B. Pfeiffer, Research Associate, Department of Plant Pathology, University of Hawaii, Honolulu, HI 96822. Phytopathology 66:1386-1390. Accepted for publication 18 June 1976. Copyright © 1976 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-66-1386.

Several unnamed pineapple cultivars were inoculated in 2 successive years with Penicillium funiculosum and Fusarium moniliforme 1, 4, and 7 weeks following chemically-induced flowering. Unnamed cultivars A, D, and a commercial cultivar. Smooth Cayenne (cultivar X) were highly susceptible to fruitlet core rot (FCR) incited by P. funiculosum. Cultivar C was highly susceptible to FCR incited by F. moniliforme. Cultivar B was susceptible to FCR incited by F. moniliforme in fruit harvested in 1974 but not susceptible in 1975. In 1975, all cultivars were susceptible to FCR incited by P. funiculosum. Symptoms of FCR incited by F. moniliforme were greatest in fruit harvested in February-March of both years and those incited by P. funiculosum were greatest from April through July. Cultivars A and X were significantly more susceptible to interfruitlet corking (IFC) than cultivars B and C. Cultivar A was significantly more susceptible to leathery pocket (LP) than cultivars B and X. Interfruitlet corking and LP were induced only by P. funiculosum and were most severe in harvests from April through June in 1974 and April through July in 1975.

Additional keywords: Ananas comosus, inoculation techniques.