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Northern Anthracnose Resistance in Red Clover¹

Resistant and susceptible red clover (Trifolium pratense L.) clones were intercrossed to study the inheritance of resistance to Kabatiella caulivora (Kirchn.) Karak., causal agent of northern anthracnose. Evaluation of F₁, F₂, and BC progeny reactions to this fungus indicated that resistance was dominant and controlled by more than three genes. Fifty-one percent of the plants were resistant to K. caulivora after two cycles of recurrent phenotypic selection, whereas 5% of the initial population were resistant. We suggested that breeding for resistance to this disease would best be accomplished by progeny-testing resistant plants before their inclusion in a recurrent selection program.

Key Words: Trifolium pratense • Inheritance • Progeny testing • Multiple-factor resistance • Disease • Recurrent phenotypic selection • Kabatiella caulivora • Quantitative resistance

² Research Geneticist, ARS, USDA, and Associate Professor of Agronomy; and Associate Professor of Plant Pathology, University of Wisconsin, Madison.

Received for publication October 7, 1972.

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