Mycelial Growth, Peach Fruit-Rotting Capability, and Sporulation of Strains ofMonilinia fructicolaResistant to Dichloran, Iprodione, Procymidone, and Vinclozolin

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Abstract
Among 22 dicarboximide-resistant and 4 sensitive strains of M. fructicola, resistant strains produced smaller lesions or sporulated less, or both, on fungicide-treated and untreated peach fruits than did sensitive strains. Mixed inocula containing equal numbers of propagules of resistant and sensitive strains produced at least 3-fold more sensitive conidia than resistant conidia. Sensitive and resistant strains sporulated on untreated fruit, whereas no sporulation by sensitive or resistant strains was observed on fruit treated with iprodione. Mycelial growth of resistant strains on fungicide-amended (25 .mu.g a.i.[active ingredient]/ml) potato-dextrose agar was less on plates containing dichloran than of those containing iprodione, procymidone or vinclozolin.