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Sunflower rust, caused by the fungus Puccinia helianthi Schwein., was not a serious problem for many decades because of successful deployment of effective resistance genes in commercial sunflower (Helianthus annuus L.) hybrids in North America. In the 1980s and early 1990s, however, a shift in virulence of the rust race population in North America rendered most of the commercial hybrids susceptible...
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