Abstract
Septoria tritici blotch (STB), caused by the ascomycete fungus Zymoseptoria tritici (formerly known as Mycosphaerella graminicola), is a devastating foliar disease causing major yield losses in wheat each year particularly in North-western Europe. Based on varieties ranked for susceptibility to STB in national trials, it was revealed that Danish Z. tritici populations are very dynamic, both over time and geographical distance. The STB ranking of varieties varied significantly between locations and years indicating differences in virulence between local populations. Comparison of results from seedling tests and field trials reveals that these two types of screenings can be used in combination, since a high correlation was observed in variety rankings for STB susceptibility. Inoculation experiments with seedlings show significant differences in the virulence of pathogen populations originating from different locations within Denmark. Significant changes over time were observed in the variety, Mariboss. An increased susceptibility in this variety followed an intensive cropping period, hence supporting a boom and bust scenario. In conclusion, results from this study indicate the importance of cultivating a diverse set of varieties in order to avoid the boom and bust scenario. Furthermore, varieties should be tested for resistance in several locations in order to ensure an effective and durable resistance.
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