New chemistry may make fungicide choices tougher

“It is clear the minimum starting point is an SDHI+triazole, but the strobilurins will still have a role. Getting the economics right will be difficult.”

But with SDHIs and triazoles both performing well on rust, would there be a role for strobilurins in terms of rust control in the future?, Mr Clark asked.

“Further west and north we could be using strobs to keep crops greener for longer. That might be the answer: strobs for the north and west, SDHIs for the east.

“The good news is that because they are all good fungicides, you will get good disease control whatever you use,” he said.

The downside to the arrival of the latest SDHI or carboxamide fungicides is that this is the first time new chemistry has come on to the market with field resistance to it already confirmed, although there is currently no recorded resistance in cereal pathogens, said Mr Clark.

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