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Races of Pseudomonas syringae pv. glycinea on Commercial Soybean in Eastern North Dakota

May 1997 , Volume 81 , Number  5
Pages  541 - 544

L. K. Prom , Postdoctoral Research Associate , and J. R. Venette , Professor, Department of Plant Pathology, North Dakota State University, Fargo 58105-5012



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Accepted for publication 18 February 1997.
ABSTRACT

In a survey conducted from 1991 to 1993 of 170 commercial soybean (Glycine max) fields in North Dakota, 80% had plants with obvious symptoms of bacterial blight. Strains (n = 164) isolated from field-grown plants and characterized as Pseudomonas syringae pv. glycinea were inoculated onto wounded, fully expanded unifoliolate leaves of differential cultivars Acme, Lindarin, Harosoy, Chippewa, Merit, Flambeau, and Norchief. Reactions of the differentials showed that five of the eight known races in the United States were present in North Dakota. Race 4 constituted 63%, race 6 was 22%, race 2 was 7%, race 3 was 0.3%, and race 5 was 0.1% of the race profile. Five pathogenic strains could not be characterized as one of the known races.



© 1997 The American Phytopathological Society