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Spring Wheats Immune or Highly Resistant to Ustilago tritici. J. Nielsen, Agriculture Canada, Research Station, Winnipeg, Manitoba R3T 2M9. Plant Dis. 67:860-863. Accepted for publication 5 January 1983. Copyright 1983 Department of Agriculture, Government of Canada. DOI: 10.1094/PD-67-860.

A total of 2,644 lines or cultivars of spring wheat of diverse origin were tested for their reaction to 31 races of Ustilago tritici that originated from 12 countries. Two hundred four immune or highly resistant entries were identified by an improved partial-vacuum technique of inoculation. Because new races of loose smut of wheat appear to arise infrequently, the resistance of these entries may be long-lasting.