Resistance development was dramatic with strobilurins, while with the azoles, gradual and partial for some fungal pathogens. So how long will it be before the activity of the SDHI fungicides is broken down? That is one of the key questions being answered in an ongoing HGCA-funded LINK project to prolong the usefulness of the SDHIs by understanding the mechanisms of fungicide resistance. The focus is on the most important wheat disease that the new generation of active ingredients successfully controls - septoria. Bart Fraaije, of Rothamsted Research, believes the SDHIs will be neither like the strobilurins nor azoles, but will fall somewhere between the two.
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