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Benomyl Residues in Valencia Oranges from Postharvest Applications Containing Emulsified Oil. G. Eldon Brown, Plant Pathologist III, Florida Department of Citrus, University of Florida, Institute of Food and Agricultural Sciences, Agricultural Research and Education Center, P.O. Box 1088, Lake Alfred 33850; Phytopathology 64:539-542. Accepted for publication 1 November 1973. DOI: 10.1094/Phyto-64-539.

Residues of methyl 2-benzimidazolecarbamate (MBC) in Valencia oranges were increased 2- to 3-fold when 1% spray oil was added to nonrecovery spray applications of 500 ppm of benomyl 0 to 3 days prior to use. A treating suspension of 175 ppm benomyl with 1% spray oil provided residues similar to those obtained with an application of 500 ppm of benomyl without oil. Spray oil not only increased residues on the fruit surfaces, but it also increased those in the flavedo and albedo layers of the peel. Oil did not increase MBC residues when benomyl-oil-water emulsions were applied 7 days after preparation. However, significant increases in MBC residues were attained if the oil was added to 7-day-old benomyl suspensions immediately before application.