Isolates of Pyrenophora teres from Montana and the Mediterranean Region That Produce Spot-Type Lesions on Barley. H. E. Bockelman, Postdoctoral Fellow, Plant Pathology Department, Montana State University, Bozeman 59717. E. L. Sharp, Professor, Plant Pathology Department, and M. E. Bjarko, Research Assistant, Plant and Soil Science Department, Montana State University, Bozeman 59717. Plant Dis. 67:696-697. Accepted for publication 12 February 1983. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-696.

Isolates of Pyrenophora teres f. maculata, the causal organism of spot-type symptoms on barley leaves, are described from Morocco, Tunisia, Turkey, and Montana. Growth on V-8 agar and conidial characteristics were indistinguishable from those of P. teres f. teres. In seedling inoculations, the maculata isolates from Morocco, Tunisia, and Turkey generally produced larger lesions than the Montana isolate. Most cultivars tested were intermediate in reaction to the isolates from Morocco, Tunisia, and Turkey. The cultivar Dekap was susceptible to all but one isolate.

Keyword(s): net blotch.