Abstract
The in vivo activity of several new fungicides was tested on strains of P. expansum resistant and sensitive to benomyl. In simulated commercial storage, CGA-64251 [1-[[2-(2,4-dichlorophenyl)-4-ethyl-1,3-dioxolan-2-yl]methyl]-1H-1,2,4-triazole], 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.

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