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Physiologic Specialization of Septoria tritici. Z. Eyal, Division of Mycology and Plant Pathology, Tel-Aviv University, Ramat Aviv, Israel; Z. Amiri(2) and I. Wahl(3). (2)(3)Division of Mycology and Plant Pathology, Tel-Aviv University, Ramat Aviv, Israel. Phytopathology 63:1087-1091. Accepted for publication 20 January 1973. DOI: 10.1094/Phyto-63-1087.

Contrary to the reports from other countries, our studies in Israel revealed physiologic specialization in Septoria tritici. Cultures of this pathogen displayed differential interactions with the wheat accessions involved. Significantly, culture number 12, originally isolated from durum wheat, was very distinctive in its parasitic characters and deviated pronouncedly from the cultures secured from Triticum aestivum plants in various parts of the country. Promising sources of resistance to Septoria leaf blotch were found. The nature of physiologic specialization of S. tritici and its bearing on breeding for disease resistance is discussed.