Written by Charlotte Cunningham
Controlling septoria; the loss of multi-site fungicide chlorothalonil; having fewer fungicide active ingredients in general; and control of yellow rust have come out as as the biggest challenges facing wheat disease control in 2020, according to a Syngenta survey. Charlotte Cunningham reports. In a survey conducted independently for Syngenta, results showed every advisor questioned and nearly every farmer was highly concerned about the revocation of chlorothalonil – with the last date for use being 20 May 2020. Chorothalonil has become a backbone of Septoria tritici management as resistance or reduced sensitivity has appeared in other fungicide groups, such as strobilurins and triazoles, and for protecting SDHI fungicides, says Syngenta fungicide campaign manager, David Ranner. Accordingly, its loss is expected to have a major impact in several areas, the survey revealed. These included: higher levels of Septoria and Septoria resistance; a need to use less effective alternatives or more expensive fungicide chemistry; lower yields and higher costs of production. “Certainly, the loss of chlorothalonil will change how we have to tackle Septoria tritici,” says David. “Two thirds of advisors and 40% of farmers spontaneously mentioned the loss of chlorothalonil and fungicides in general as challenges or concerns for wheat disease control in 2020.…
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