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Field Induction of Pineapple Interfruitlet Corking, Leathery Pocket, and Fruitlet Core Rot with Penicillium funiculosum. K. G. Rohrbach, Associate Plant Pathologist, Department of Plant Pathology, University of Hawaii, Honolulu 96822; J. B. Pfeiffer, Research Associate, Department of Plant Pathology, University of Hawaii, Honolulu 96822. Phytopathology 66:392-395. Accepted for publication 27 October 1975. DOI: 10.1094/Phyto-66-392.

Two pineapple cultivars were inoculated in the field with 1 × 107 spores/ml of Penicillium funiculosum at 1, 4, and 7 weeks following chemically forced flowering. Infection induced interfruitlet corking, leathery pocket, fruitlet core rot, and inhibition of fruitlet enlargement. The latter accounted for significant reductions in fruit size in cultivar A but not in cultivar Smooth Cayenne. Inoculation at 10 weeks induced disease symptoms only in Smooth Cayenne. No insect associations were noted.

Additional keywords: Ananas comosus, inoculation techniques.