I have a Bee Gym that I have placed on the mesh floor of a nearby hive with a monitoring board underneath that I check occasionally. At first most of the mites that fell did so directly beneath the Bee Gym but lately there haven't been many mites. A lady in the next village also has a Bee Gym and she too found mites dropping beneath it.
Stuart Roweth has now made a modified version consisting of a set of 10 plastic scratching peg forms about as big as your little finger from knuckle to nail (I don't know what that is in metric) which you are told to plug into each other through sheets of foundation (or drawn comb) stretching across the brood nest. I have a set but have yet to put them into action.
Chris
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