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Disease Control and Pest Management

Mycelial Growth, Peach Fruit-Rotting Capability, and Sporulation of Strains of Monilinia fructicola Resistant to Dichloran, Iprodione, Procymidone, and Vinclozolin. David F. Ritchie, Assistant professor, Department of Plant Pathology, North Carolina State University, Raleigh 27650; Phytopathology 73:44-47. Accepted for publication 19 July 1982. Copyright 1983 The American Phytopathological Society. DOI: 10.1094/Phyto-73-44.

Among 22 dicarboximide-resistant and four sensitive strains of Monilinia 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 threefold 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 μg a.i. per milliliter) potato-dextrose agar was less on plates containing dichloran than of those containing iprodione, procymidone, or vinclozolin.