Pathogenicity analysis of yellow (Stripe) rust of wheat and its significance in a global context. Chapter 3.
1988
Stubbs R.W.
Yellow (stripe) rust of weat (Puccinia striiformis Westend. f.sp. tritici) is studied by the Research Institute for Plant Protection (IPO) on an international scale. Races (virulences) are identified on seedlings of a broad set of old and new differential cultivars with some known, but mostly unknown, resistance genes under controlled conditions. Virulence related to race-specific mature plant resistance is analyzed in race nurseries (separate field plots). The relationship between the distribution of pathogen virulences and host resistances is evident but yet under-studied. Results are presented of an analysis of yellow rust infecting triticales and cultivars with resistance derived from rye. The zonal distribution of yellow rust races in Europe, Africa, Asia, and South America is described. A continuous survey of changes in pathogenicity in race populations is highly recommended with regard to breeding for resistance and the evaluation of host resistance under different environments.
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