UK: Bayer issues light leaf spot warning to growers

Throughout late autumn and into 2021, there has been evidence of light leaf spot at relatively high levels on the leaf samples from susceptible varieties, after incubation. During January, varying levels of disease were reported using Bayer's SpotCheck service, with 68% of samples showing positive signs, despite the colder weather.

Even though the cold weather continued into February, mid-month results show very high levels of disease, with nearly 98% of samples showing positive light leaf spot infection after incubation. While light leaf spot has historically been a disease of the north, it is now widespread according to Bayer, with infection found regularly in southern parts of the UK.

A move to earlier drilling may be one of the causes in this increase in infection, the firm says, with growers trying to get crops established quickly, to grow away from pest pressure.

Light leaf spot can develop between 4 and 16°C, with rainfall and higher temperatures causing infection to spread more readily. While the recent cold snap may have suppressed infection and disease expression for a while, any latent infection present in the leaf is more likely to develop into early spring.

Philip Walker, plant pathologist at ADAS, who runs the SpotCheck tests, said there was always variation year on year with light leaf spot infection levels. "We are roughly on-par with last year when we saw high infection levels in samples as we came out of winter," he added. "It’s fair to say that all fields are now at risk, with infected samples received from farms across the UK.

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