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Components of Slow-Rusting in Barley Infected with Puccinia hordei. Dennis A. Johnson, Graduate Student, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108; Roy D. Wilcoxson, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108. Phytopathology 68:1470-1474. Accepted for publication 25 April 1978. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1470.

In fast-rusting barley (Hordeum vulgare) cultivars Manker, Speciale, Larker, and Beacon, Puccinia hordei had a shorter latent period (days for 50% of the uredia to form), and produced more urediospores per square centimeter of leaf surface, more spores per uredium, more uredia per square centimeter of leaf surface, and larger uredia, than in the slow-rusting barleys MN 7572, MN 7544, MN 9062, and Rogers. The components of rust development were related to each other and to the area under the disease progress curve, as indicated by significant correlation coefficients.