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New Fungicides to Control Benomyl-Resistant Penicillium expansum in Apples. Clyde L. Burton, Research Plant Pathologist, ARS, USDA, Botany and Plant Pathology Department, Michigan State University, East Lansing 48824. Donald H. Dewey, Professor, Horticulture Department, Michigan State University, East Lansing 48824. Plant Dis. 65:881-883. Accepted for publication 4 March 1981. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1981. DOI: 10.1094/PD-65-881.

The in vivo activity of several new fungicides was tested on strains of Penicillium expansum resistant and sensitive to benomyl. In simulated commercial storage, CGA-64251, prochloraz, and iprodione showed promise as effective replacements for benomyl and thiabendazole to control benzimidazole-resistant strains of blue mold on apples. When mixed with either diphenylamine or calcium chloride and applied as a postharvest drench, these fungicides did not injure the fruit.