![]() “Fungicide programmes are going to be even more challenging to plan,” he says. He says experience tells us that any aggressive genotypes originating in countries such as the Netherlands always jump to the UK eventually, so it is only a matter of time before it threatens British crops. However, news from across the Channel is not so positive, with manufacturer Corteva confirming resistance in the 43_A1 lineage to its active substance oxathiapiprolin, contained in products like Zorvec Endavia.ĭavid Cooke, JHI’s project lead at FAB, confirmed that the troublesome genotype has been isolated from a sample taken at Teagasc’s Carlow site in Ireland as it continues to spread across north-west Europe. See also: How potato grower variably applies potash and magnesiumįurther good news that 43_A1, a genotype resistant to carboxylic acid amide (CAA) fungicides such as mandipropamid and widespread in mainland Europe, has not yet been attributed to any outbreaks here in GB. There is little change in the British population this year, with 36_A2 (51%) and 6_A1 (34%) still dominating the 830 genotypes isolated from samples sent to the James Hutton Institute (JHI) in Dundee for testing. The Fight Against Blight (FAB) monitoring initiative, which looks for genetic changes in the late blight population and its sensitivity to key fungicides, delivered its latest results at the 2023 British Potato event (BP2023). A late blight genotype that is resistant to a second fungicide mode of action continues to spread through Europe, meaning British potato growers will need to take extra care when planning control strategies next year.
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