Following an idea from an Austrian citizen scientist (thanks Andi!), I went to the workshop in the basement of university today, to modify a sliding gate hive entrance. In INSIGNIA, the third monitoring colony is used for Apistrips, beebread collection and the Beehold tubes. In contrast to colony 1, no pollen trap is installed, and hence no adapter can be placed to hold the tubes at the hive entrance. Therefore I made four holes in the sliding gate, to fit the two Beehold tubes (way in for the bees) and the two dummy tubes (way out for the bees).
Will show you how it works in the next days!