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Phyllosticta maydis species nova, the Incitant of Yellow Leaf Blight of Maize. D. C. Arny, Departments of Plant Pathology, University of Wisconsin, Madison 53706; R. R. Nelson, Department of Plant Pathology, The Pennsylvania State University, University Park 16802. Phytopathology 61:1170-1172. Accepted for publication 26 April 1971. DOI: 10.1094/Phyto-61-1170.

Phyllosticta maydis sp. n. is designated as the incitant of yellow leaf blight of maize, first observed in 1967. Pycnidia develop in older lesions, especially if held under moist conditions. The conidia are generally within the range of 12-15 × 4-6 µ. Newly emerged conidia are single-celled, although some crosswalls are formed upon germination.