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Seed Treatment for Control of Pyrenophora Leaf Stripe of Barley. R. H. Johnston, Research Associate, Department of Plant Pathology, Montana State University, Bozeman 59717. S. G. Metz, Biological Technician, Agricultural Research Service, U.S. Department of Agriculture, and J. H. Riesselman, Extension Plant Pathologist, Department of Plant Pathology, Montana State University, Bozeman 59717. Plant Dis. 66:1122-1124. Accepted for publication 22 March 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-1122.

The occurrence in 1978 of Pyrenophora graminea in a commercial field of Summit barley in Montana necessitated screening numerous registered and experimental seed treatment fungicides for efficacy in controlling barley leaf stripe. Tests were conducted over 2 yr and involved applying materials at varying rates. Seed treatment increased emergence, decreased infection, and increased yield. Seven experimental fungicides completely controlled the disease. Delayed seeding increased emergence and decreased both infection percentage and yield. The fungicides had no residual effect on emergence or infection when seed harvested from the field was grown in the greenhouse.

Keyword(s): fungicides, Helminthosporium stripe, Hordeum vulgare.