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    Arable & Livestock

    Chemical-free insect control trial sees success

    Matthew TiltBy Matthew TiltDecember 3, 20214 Mins Read
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    Drosophila,Suzuki,-,Commonly,Called,The,Spotted,Wing,Drosophila,Or

    British farmers are reportedly a step closer to using technology to slash the need for agricultural insecticides after a world-first trial achieved a 91% reduction in an invasive target pest.

    Agritech start-up BigSis conducted the trial – using an updated version of the sterile insect technique (SIT) – in partnership with Berry Gardens, the UK’s largest supplier of berries and cherries, and the world-renowned research institute NIAB EMR.

    “SIT has long been recognised as the perfect solution for insect pest control,” said BigSis founder Glen Slade. “But in the 60 years since it was conceived, it’s always been too expensive to deploy beyond a limited number of special-use cases.”

    SIT involves sterilising and releasing male insects into the crop, where they mate with wild females to prevent the rapid increase in pest populations that leads to crop damage. Species-specific, non-toxic and resistance-immune, the approach is technically capable of taking the place of chemical insecticides in many agricultural crops.

    “BigSis has turned to artificial intelligence and robotics to automate SIT, raising insects individually,” explained Mr Slade. “It’s a breakthrough that slashes the cost of SIT solutions by as much as 90%.

    “We’re finally bringing SIT to growers as an affordable, farm-scale solution for insect pest control in agricultural crops.”

    Larvae,Of,Drosophila,Suzuki,In,The,Raspberry,Fruit.,It,Is
    SWD larvae

    The trial

    Conducted in Kent, the trial focused on the control of spotted-wing drosophila (SWD), a globally invasive pest of soft fruit that can cause thousands of pounds worth of damage. Farmers spend up to £11,000 per hectare using currently approved chemical treatments and labour-intensive hygiene measures in a bid to control the pest

    Sterile SWD males were released in and around a crop of everbearing strawberries between April and the end of harvest. Using sticky traps with lures, the number of wild female SWDs were monitored at the treated site and two control sites.

    During the trial, numbers of female SWDs in the treated plots barely rose above one per trap per week, compared to a peak of nearly ten insects per trap per week in the untreated controls.

    “We’re thrilled that this world-first trial of SIT to control SWD has given such a convincing demonstration of season-long control, with a suppression result of up to 91%,” said Mr Slade. “SIT ensures that pest numbers never reach a critical level, confirming the premise that prevention is better than cure.

    “It also gives us and our two partners a solid foundation to move into 2022 with our larger field trial programme, which is being supported by a £500,000 grant from Innovate UK. This will bring cherries and raspberries into the mix.”

    Richard Harnden, Director of Research at Berry Gardens, enthused: “It’s been nearly a decade since SWD arrived in the UK, and the BigSis solution might finally provide the breakthrough in chemical-free control that the industry has been seeking.

    “We look forward to success in next season’s field trials, with a view to widespread adoption of the solution by our growers.”

    BigSis SWD trial results graph
    BigSis SWD trial results graph

    Head of Pest and Pathogen Ecology at NIAB EMR, Dr Michelle Fountain, commented: “These data provided new insights into SWD dispersal and behaviour in commercial crops. We are very encouraged by this control technology for SWD, with its added benefit of preserving current biological controls for other soft fruit pests by reducing plant protection inputs.

    “I envisage further learning and positive results from the grant-funded studies and trials planned for the next 16 months.”

    The recent completion of a £1.5 million seed-plus funding round will allow BigSis to construct a pilot production line for sterile male SWD at its new Reading facility, with the possibility for commercial sales next year.

    The BigSis SWD solution is already approved for sale in England.

    Mr Slade says BigSis expects to become a billion-pound crop protection company. “We are ideally placed to address the ‘perfect storm’ facing agriculture – regulatory pressure on agrochemicals, consumer demand for ‘greener’ food, increased pest pressure as the climate warms, and the increasing problems of insects’ resistance to chemical controls.

    “SWD is our first market-ready solution before we move on to commercialising of our next SIT
    solution, for codling moth, with others to follow.”

    For more information go to www.bigsis.tech

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    Matthew Tilt
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    Machinery editor for Farm Contractor & Large Scale Farmer. Matt has worked as an agricultural machinery journalist for five years, following time spent in his family’s Worcestershire contracting business. When he’s not driving or writing about the latest farm equipment, he can be found in his local cinema, or with his headphones in, reading a good book.

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