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Qualitative Inheritance of Fungicide Tolerance in a Natural Population of Cochliobolus carbonum. D. R. MacKenzie, Former Research Assistant, The Pennsylvania State University, University Park 16802, Present address of senior author: CIMMYT, Londres 40, Mexico 6, D.F., Mexico; H. Cole(2), and R. R. Nelson(3). (2)(3)Associate Professor of Plant Pathology and Chemical Pesticides, and Professor of Plant Pathology, The Pennsylvania State University, University Park 16802. Phytopathology 61:458-462. Accepted for publication 11 November 1970. DOI: 10.1094/Phyto-61-458.

Single gene tolerance to specific fungicides was detected in some isolates of a worldwide collection of Cochliobolus carbonum. Tolerance to Acti-dione [3-(2-[3,5-dimethyl-2-oxocyclohexyl]-2 hydroxyethyl) glutarimide] and Cadminate (cadmium succinate) enabled some isolates to tolerate much higher concentrations than others for both vegetative growth and spore germination. Genetic linkage between genes for Cadminate tolerance and Acti-dione tolerance or between mating type and race was not evident. An experimental model is now available for the evaluation of fungicide tolerance in a disease situation.