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Occurrence and Characteristics of Isolates of Pseudomonas syringae on Winter Wheat. J. D. Otta, Assistant Professor of Plant Science, Department of Plant Science, South Dakota State University, Brookings, SD 57006; Phytopathology 67:22-26. Accepted for publication 16 August 1976. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-22.

Pseudomonas spp. pathogenic on wheat were isolated from 21 samples of winter wheat seed from Nebraska, South Dakota, North Dakota, Alberta, and Saskatchewan. Seed infestation ranged from 0.2 to 5.0% for most samples. One Karkhof sample from Lethbridge had 12.8% infestation. Isolates from diseased leaves of wheat, corn, foxtail, and sorghum and from wheat kernels could not be differentiated from known isolates of P. syringae in biochemical, serological, or pathological tests. The distribution among P. syringae serotypes was different for isolates from wheat, corn, foxtail, and sorghum than from stone and pome fruits.

Additional keywords: Pseudomonas atrofaciens.