Arable
Resist temptation to ‘chase’ fungicide resistant septoria
rowers should resist the temptation to increase azole or SDHI in a bid to counter fungicide insensitivi- ty in septoria tritici, suggests an ADAS study.
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A recent analysis of AHDB fungicide performance data by ADAS found no significant eco- nomic benefit from increasing azole or SDHI dose above regu- lar farm practice. The study ex- amined the benefit of the SDHI or azole applied in mixture with chlorothalonil.
Although some growers be- lieve septoria must be controlled at all costs, the study found that extra yield from increasing azole or SDHI doses above current prac- tice would not be enough to out- weigh the cost of the extra fun- gicide.
Paul Gosling, who manages fungicide performance research at AHDB, said: “Septoria is becom- ing harder to control with azoles and SDHIs. However, farmers should not be tempted to increase rates, because this is not economic and would drive resistance faster.”
Analysis
The economic calculations an- alysed all the AHDB septoria dose-response data up to 2018, and accounted for the effect of typical UK spray programmes and the need to be risk-averse in treatment decisions.
Multisite-acting fungicides are not affected by resistance and re- main key to maintaining septo- ria control and managing resist- ance. Although chlorothalonil will still be available this season, the
industry must look at the poten- tial of other multisites that act against septoria.
In partnership with the Fun- gicide Resistance Action Group (FRAG-UK), the AHDB contin- ues to monitor the evolving resist- ance situation and provide the in- dustry with the latest guidance, to ensure robust disease control, while minimising selection for re- sistance. Varietal selection is increas- ingly important when it comes to combating septoria.
The latest edition of the Rec- ommended List includes varieties with excellent levels of built in re- sistance to septoria. KWS Extase and LG Sundance have disease ratings of 8.1 and 7.9 respective- ly, where 1 is susceptible and 9 is resistant.
Growers should be risk- averse when deciding whether to treat septoria
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