The use of a multisite protectant fungicide can double the effective life of single-site curative fungicides, such as SDHls and azoles, for the control of septoria in wheat crops.Data modelling work by Michael Grimmer, principal consultant for crop disease management at consultants Adas,/hows that adding the multisite fungicide folpet to an azole-SDHI mix at T1 and T2 increased the effective life of that chemistry from 13 years to 21-27 years.In addition, when the rates of the azole and SDHI were reduced the use of folpet further extended the life of these single-site products to 28 years. Multisite protectants, such as folpet, are largely unaffected by shifts in sensitivity leading to diseases becoming resistant to fungicides. "Using the maximum rate of folpet with the minimum rates of single-site fungicides proved to be the best resistance management strategy," Dr Grimmer tells Farmers Weekly.
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