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Distribution, Prevalence, and Severity of Fungal Foliar Diseases of Spring Wheat in New York in 1984 and 1985. W. C. da Luz, Graduate Student, Department of Plant Pathology, Cornell University, Ithaca, NY 14853. G. C. Bergstrom, Assistant Professor, Department of Plant Pathology, Cornell University, Ithaca, NY 14853. Plant Dis. 70:842-847. Accepted for publication 2 April 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-842.

Ten fungal foliar diseases were found in surveys of two spring wheat cultivars, Max and Sinton, in 12 central and western New York counties in 19841985. Stagonospora nodorum spot, tan spot, and powdery mildew were the most prevalent and severe diseases in 1984. Powdery mildew was also prevalent and severe in 1985. Fungal leaf spots, although prevalent, were less severe in 1985 than in 1984; Phaeosphaeria nodorum was the most commonly isolated leaf spot fungus. Spot blotch and Ascochyta spot were scattered and of low severity in 1984 and were absent in 1985. Stem rust was severe on Max late in the 1984 growing season, but it was completely absent in 1985. Leaf rust and Stagonospora avenae spot were severe in a few fields in 1984 but occurred infrequently and in slight amounts in 1985. Scab occurred in relatively low levels in both years. Loose smut occurred in trace amounts in two fields of Sinton in each year.

Keyword(s): Bipolaris sorokiniana, Cochliobolus sativus, Drechslera tritici-repentis, Leptosphaeria avenaria f. sp. triticea, L. nodorum, Phaeosphaeria avenaria f. sp. triticea, Pyrenophora tritici-repentis, Septoria avenae f. sp. triticea, Septoria nodorum, Stagonospora avenae f. sp. triticea, Stagonospora nodorum.