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Propagules of Pyrenophora trichostoma. Robert M. Hosford, Jr., Associate Professor, Department of Plant Pathology, North Dakota State University, Fargo 58102; Phytopathology 62:627-629. Accepted for publication 12 January 1972. DOI: 10.1094/Phyto-62-627.

Conidia and dark aerial hyphae of Helminthosporium tritici-repentis on wheat stubble appeared to be, like ascospores, viable propagules of Pyrenophora trichostoma. They developed in lesions on green wheat leaves, on mature standing wheat, on year-old wheat stubble, and on pseudoperithecia on wheat stubble. In the differing environments of North Dakota, Canada, and North Africa they varied in their abundance, their time and place of appearance, and in their relationship to epiphytotics of leaf blight in wheat.

Additional keywords: Helminthosporium tritici-vulgaris, Leptosphaeria avenaria f. sp. triticea, Septoria.