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Fungicide Resistance Detection, Characterization, and Management
Fungicide Resistance Detection, Characterization, and Management
An isolate of a fungus growing on media with no fungicide (left) vs. growth of the same isolate exposed to the fungicide (right). This particular isolate has an EC50 of 20.52, meaning it requires 20.52 ppm of the fungicide to inhibit 50% of fungal growth. This particular individual fungus from a larger population would likely be considered resistant to the fungicide.
Background
Fungicides vary in their modes of action. Those with a single site mode of action tend to have a higher risk of fungal populations shifting towards resistance due to selection pressure from repeated fungicide use or a genetic mutation that naturally confers resistance. Over time, resistance can dominate within a population, rendering the fungicide ineffective against that population.
Impact
Identifying whether a population is shifting towards resistance to a particular fungicide will help growers select appropriate tools to manage potato diseases.
In our Extension efforts, our lab screens for fludioxonil and difenoconazole resistance in individual isolates. Contact us if you would like more information. We also provide information on fungicide resistance management to prolong the utility of the few fungicides we have to manage Fusarium dry rot.
For our Research efforts, we continue to work on identifying the impact of fludioxonil resistance in populations of Fusarium sambucinum, a predominant pathogen that causes Fusarium dry rot in potato in the Pacific Northwest.
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