A while back (years) the forestry commission in Kielder forrest Northumberland used an industrial one to try and keep the camp site's clear of the damned midge it used a carbon dioxide bottle to attract them and it was like a great big hoover type machine that sucked them into a bag. It was on the telly I saw it being used, a news broadcast I think, they were tipping large sackfull's every day, don't know if it made much difference tho'.
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