Assessment of Yield Component Losses Caused in Plants of Spring Wheat Cultivars by Selected Isolates of Septoria tritici

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Abstract
Four spring wheat [Triticum aestivum] cultivars expressing different levels of loss-response to S. tritici and of variable height and maturity each were uniformly inoculated separately with 4 selected isolates of the pathogen that varied in virulence. The progress and severity of the disease, and yield per head, 1000-kernel wt and number of kernels per head were assessed in randomly selected plants within each plot. Losses in yield for each treatment were evaluated by comparing the yield in inoculated plots to that in fungicide-protected plots. The isolates exhibited differential variations in virulence and agressiveness based on disease severity and losses in yield on all 4 wheat cultivars tested. The tolerant cultivar ''Miriam'' sustained nonsignificant losses in yield (based on measurements of yield components) despite leaf blotch severity similar to that of the nontolerant (vulnerable) cultivars ''Bet Dagan 131'' and ''Barkai.'' Vulnerable and tolerant cultivars were evaluated on the basis of the linear relationship between losses in yield per head, 1000-kernel wt, number of kernels per head and disease severity. The long-term usefulness of tolerance to S. tritici for protecting productivity is discussed in relation to other resistance types and wheat breeding methods.

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