Varietal reaction to bunt in the western wheat region of the United States
1942
Holton, C.S. | Suneson, C.A.
The reaction of 83 varieties and hybrid selections of winter wheat to bunt was determined by growing them in uniform nurseries at 11 localities in the western United States and at Kearneysville, W. Va., and inoculating them with spores obtained from commercial wheat fields n the vicinity of each nursery location, or from a composite of collections from commercial wheat fields in the entire Pacific Northwest. None of the varieties was bunt-free at all of the stations, although 36 varieties averaged less than 10% bunt and 7 averaged less than 1%. Five resistant varieties were involved in the production of 26 of the 27 most highly resistant hybrid selections. In 8 of the 12 nurseries the majority of the infected varieties and selections had less than 10% bunt. The prevalence and distribution of race groups of the bunt fungi were indicated by the reaction of the host testers included in the nurseries each year. One or more of the more virulent races appear to be fairly prevalent throughout the western region.
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