and this is now known as the windscreen phenomenon. so the way the survey was carried out is that you register to take part. and you get one of these grids. you clean your numberplate, you go on a journey, and then you have a look. and here there are just two bug splats on my number plate after half an hour s journey. and all the recordings are sent in via an app. it s the third year of the survey the first was back in 2004. conservationists say the results show a deeply worrying trend, caused in part by intensive farming. and we have thistles and we have ragwort, seen as weeds. i mean, a weed is simply a plant in the wrong place in the eye of a human. the use of herbicides and pesticides must be greatly reduced, says the charity buglife. insects are facing a perfect storm they re losing habitat, they re suffering from global warming, and they re suffering from the most powerful insecticides that we ve seen on this planet.