reviving this one!
OK, i want to make some ventilation holes, of course i'll wait 'till spring, but i'll try it on the two hives that are still empty. ok making a few holes just under the cover-top of the hive really isn't that big of a deal but i have something else to ask you. i have read that small tubes for entrance also prevent robbing, tubes are important for my top entrance since i don't want to do more than neccesary. anyway, i'll drill 3-5 little holes, and insert a tube, because the hive has an insulation space, so they won't go in there. what i want to know is, what is the minimum size of the tubes i should use, so they'd also help against robbing? 5mm?
if bee cells are 5,4 (currently, i'll try to go to natural size) 5mm sounds a bit...small, 7mm? please help!