Monitoring and forecasting fungicide resistance in rhynchosporium
About this project
Resistance has significantly reduced the performance of Bayleton, Bayfidan and Baytan against Rhynchosporium. This has probably occurred throughout most of the UK. A decline in sensitivity to propiconazole has also taken place, but Tilt/Radar still provide worthwhile Rhynchosporium control. However, Tilt exerted strong selection pressure again in 1990, and its use as a single product for Rhynchosporium control is not recommended. Changes in prochloraz sensitivity were small, and the performance of Sportak seems unchanged.
DMI/carbendazim mixtures continue to form the basis for combating any further development of DMI resistance, and these mixtures performed well. However, in 1990, well characterised carbendazim-resistant strains accounted for 1% of the total number of isolates examined suggesting that DMI/morpholine mixtures also need to be exploited for Rhynchosporium control.
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