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Genetic Control of Dodine Tolerance in Venturia inaequalis. F. J. Polach, Assistant Professor, Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva 14456; Phytopathology 63:1189-1190. Accepted for publication 27 March 1973. DOI: 10.1094/Phyto-63-1189.

Isolates of Venturia inaequalis from apple orchards in which dodine (n-dodecylguanidine acetate) had given poor scab control grew on artificial media containing two to four times the dodine concentration that isolates with no previous exposure to dodine would tolerate. Segregation of dodine tolerance in ascospore progenies of tolerant and nontolerant crosses demonstrated that tolerance is genetically controlled. The segregation ratios indicate that at least two genes are responsible for this tolerance. The poor fit of one cross to the ratios suggests that in some isolates additional factors are operating.

Additional keywords: fungicide resistance.