Abstract
Disease development was a month later than the 40-yr average. The principal race of the pathogen was NA-27, which is virulent on hosts having resistance genes Pg-1, -2, -3, -4, and -8. NA-27 accounted for 83% of the isolates and NA-16 for 7%. No virulence was found for Pg-a or Pg-16 in the 1988 oat stem rust population. Wheat stem rust overwintered in trace amounts from southern Texas to southern Georgia. A probable overwintering site was found in a plot in northeastern North Dakota leeward of a shelterbelt. Stem rust inoculum spread northward, but little disease developed because of a severe drought throughout the central and northern Great Plains (...)
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