The use of light spectrum blocking films to reduce populations of Drosophila suzukii Matsumura in fruit crops

Spotted wing drosophila, Drosophila suzukii, is a serious invasive pest impacting the production ofmultiple fruit crops, including soft and stone fruits such as strawberries, raspberries and cherries.Effective control is challenging and reliant on integrated pest management which includes the useof an ever decreasing number of approved insecticides. New means to reduce the impact of this pestthat can be integrated into control strategies are urgently required. In many production regions,including the UK, soft fruit are typically grown inside tunnels clad with polyethylene based materials.These can be modified to filter specific wavebands of light. We investigated whether targeted spectralmodifications to cladding materials that disrupt insect vision could reduce the incidence of D. suzukii.We present a novel approach that starts from a neuroscientific investigation of insect sensory systemsand ends with infield testing of new cladding materials inspired by the biological data. We show D.suzukii are predominantly sensitive to wavelengths below 405 nm (ultraviolet) and above 565 nm(orange & red) and that targeted blocking of lower wavebands (up to 430 nm) using light restrictingmaterials reduces pest populations up to 73% in field trials.