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Potato farmers are being advised to stock up on the fungicide mancozeb before sales end on 30 November to help manage resistance risk next season. This advice comes after the discovery of the 46_A1 strain of late blight with multiple resistance to fungicides in Ceredigion, Wales. This strain has shown resistance to both the CAA group of fungicides, including mandipropamid, and the OSBPI group that currently consists of oxathiapiprolin.
The infected sample was found at the Adas trials site at Lampeter in a crop of King Edward grown from Scottish seed stock. The most likely explanation for how the clone arrived at Lampeter is through windborne transmission. The arrival of the 46_A1 strain underscores the importance of effective resistance management policies for growers. Mancozeb is recommended as a valuable mixing partner for late blight protection. Growers are encouraged to secure stocks before the sales end on 30 November 2024 for use in 2025.
The Fight Against Blight (FAB) scheme, which monitors Phytophthora infestans populations, plays a crucial role in the industry’s effort to combat late blight. The scheme involves a nationwide network of agronomists, growers, and industry representatives who submit field samples for testing.
It is important for growers to adapt to the changing landscape of late blight management and utilize all available tools, including plant protection products, to support resistance genes. The discovery of the 46_A1 strain in Great Britain highlights the need for collaboration within the industry for the collective good.
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Maria Sanchez completed her Bachelor’s degree in Plant Sciences from the University of California, Davis, in the USA. Her studies focused on plant genetics and biotechnology, with an emphasis on developing disease-resistant crop varieties. Maria has contributed to several research projects aimed at improving crop resilience to climate change and is now pursuing her Master’s degree in Plant Breeding.
