‘Slug sleuth’ farmers in England help develop prediction tool to cut back on pesticide use

Slug damage to wheat and oilseed rape crops is estimated to cost almost £44m a year in the UK. Photograph: Sandra Standbridge/Getty View image in fullscreen Slug damage to wheat and oilseed rape crops is estimated to cost almost £44m a year in the UK. Photograph: Sandra Standbridge/Getty ‘Slug sleuth’ farmers in England help develop prediction tool to cut back on pesticide use Maps created as part of Defra-funded Slimers project allowed test growers to halve amount of slug pellets used Farmers believe they have a new weapon in their age-old battle against the slugs that destroy their crops: modern technology. Slug prediction maps, which have been created by computer models as part of an research project, are now helping growers to better target the use of pesticides, saving them money and reducing environmental harm. Slug damage is not just frustrating – as many gardeners will profess – but it is also expensive for arable farmers, with damage to wheat and oilseed rape crops estimated to cost almost £44m a year in the UK. The gastropod mollusc grazes on the young leaves of emerging cereal crops and has also been known to eat barley, oat and wheat seeds. Slugs also damage potatoes and can have a huge impact on vegetable crops, as whole fields sometimes have to be abandoned if there are signs of an infestation. The monitoring work is being carried out as part of the entertainingly named Slimers project – which stands for strategies leading to improved management and enhanced resilience to slugs. View image in fullscreen Farmers were recruited to work alongside scientists to increase understanding of the slug’s behaviour by setting up traps on their land. Photograph: Slimers The three-year, £2.6m scheme , which began in 2023 and comes to an end in late August, is funded by the Department for Environment, Food and Rural Affairs and led by the British On-Farm Innovation Network. A team of 28 “slug sleuth” farmers were recruited to work alongside scientists to increase understanding of the invertebrates’ behaviour by setting up traps – large plastic saucers – on their land. This information was fed into a computer model, and an algorithm was used to predict where the slugs would be found in arable fields, while soil samples were also taken. The resulting slug prediction maps were tested by 16 farmers over the past autumn and winter, and have already helped them to halve the amount of slug pellets they need to use to control the pests. Charles Paynter, a farmer in Bedfordshire who was involved with Slimers from the start, has already cut back on his use of pesticides. “My threshold for taking control measures is higher now because I have been able to prove to myself that I can evaluate the risks from slug activity with greater accuracy,” he said. The chemical metaldehyde, which was commonly used in slug control products in the UK, was banned in 2022 , and this has resulted in the increased use of ferric phosphate pellets. There is, however, appetite for