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Response of Penicillium digitatum Strains to Benomyl, Thiabendazole, and Sodium O-Phenylphenate. B. L. Wild, Officer-in-charge, Gosford Horticultural Postharvest Laboratory, New South Wales Department of Agriculture, P.O. Box 355, Gosford, N.S.W., Australia 2250; L. E. Rippon, Senior Research Horticulturist, Gosford Horticultural Postharvest Laboratory, Gosford, N.S.W., Australia 2250. Phytopathology 65:1176. Accepted for publication 13 May 1975. DOI: 10.1094/Phyto-65-1176.

A benomyl-resistant strain of green mold, Penicillium digitatum, was found following investigations into poor mold control of this organism. The strain was tested for its response to a range of benomyl concentrations up to 10,000 µg/ml and compared with a sensitive strain. Results, with the resistant strain, showed that benomyl concentrations of up to 1,000 µg/ml had no effect on mold development. Levels of 5,000 and 10,000 µg/ml only slightly reduced the numbers of affected fruit. The standard thiabendazole treatment of 1,000 µg/ml slightly reduced mold development when compared with all benomyl treatments. Sodium o-phenylphenate controlled both strains. Moldiness incited by a benomyl-sensitive strain, was reduced by all fungicide treatments.

Additional keywords: postharvest storage, green mold, citrus.