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Resistance to erysiphe graminis f sp tritici puccinia recondita f sp tritici and septoria nodorum in wild triticum species



Resistance to erysiphe graminis f sp tritici puccinia recondita f sp tritici and septoria nodorum in wild triticum species



Plant Disease 68(1): 10-13



Accessions (79) encompassing 23 Triticum spp. were inoculated with cultures or culture composites of E. graminis f. sp. tritici, P. recondita f. sp. tritici, or S. nodorum. The cultures of E. graminis and P. recondita were chosen so that most of the virulence genes found in the eastern USA were represented. Powdery mildew and leaf rust ratings were bimodally distributed, with high ratings outnumbering low ratings by as much as 1.8 to 1. Ratings of leaf symptoms caused by S. nodorum were skewed toward resistance and susceptibility outnumbered resistance by as much as 4.1 to 1. Reaction to S. nodorum was correlated with reaction to E. graminis. T. carthlicum may be a source of resistance to E. graminis, T. monococcum may provide resistance to E. graminis and P. recondita, and resistance to E. graminis, P. recondita and S. nodorum may be found in the T. timopheevi population. Nine accessions had resistance to all 3 pathogens. Seven of these were highly pubescent. The association of resistance to leaf pubescence may affect the expression of any resistance transferred to T. aestivum.

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