Honors College Thesis

 

Cross-resistance to azole fungicides in Zymoseptoria tritici disease of wheat Public

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https://ir.library.oregonstate.edu/concern/honors_college_theses/6682x588j

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  • Fungicide resistance has become an increasing problem in North American populations of Zymoseptoria tritici, the causal agent of septoria leaf blotch of wheat. The goal of this experiment was to determine whether Z. tritici’s resistance to one azole fungicide would predict resistance in other fungicides within the same family. Cross-resistance could have implications on the fungicides available to treat the disease locally, as seen in Europe over the past decade. 178 isolates were harvested from leaves collected from two locations in the Willamette Valley. Isolates were grown in the presence of 12 serial dilutions of four different azole fungicides (cyproconazole, propiconazole, tebuconazole, and prothioconazole), their growth measured, and their respective EC50s calculated. In these assays strong cross-resistance was found between cyproconazole and propiconazole; weak cross resistance between cyproconazole and tebuconazole, propiconazole and tebuconazole, and prothioconazole and tebuconazole; and no cross-resistance between cyproconazole and prothioconazole or prothioconazole and propiconazole. These findings have significant implications for the Willamette Valley wheat industry; namely, growers can continue to use a diversity of azole fungicides to successfully control Z. tritici.
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