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Pathogenicity of Different Isolates of Stemphylium botryosum on Alfalfa Differentials. O. L. Borges, Former Graduate Student, University of California, Davis 95616, Present address: Universidad Central de Venezuela, Facultad de Agronomia, Maracay, Estado Aragua, Venezuela; E. H. Stanford(2), and R. K. Webster(3). (2)(3)Professor of Agronomy and Professor of Plant Pathology, University of California, Davis 95616. Phytopathology 66:715-716. Accepted for publication 12 December 1975. DOI: 10.1094/Phyto-66-715.

The pathogenicity of several isolates of Stemphylium botryosum was determined on detached leaves of clones selected from cultivars and sub-species of the Medicago sativa-falcata complex. Seven biotypes of the pathogen were identified. A Medicago hemicycla selection was resistant to all of the isolates of S. botryosum and a high level of resistance occurred in some selections of M. falcata and M. cancellata.

Additional keywords: disease resistance.