When using hardware cloth for SBB beetle traps you use #8 which is 1/8 "
Some have beetles that are too big for #8 so they make their traps out of #6 hardware cloth (hard to find).
So I would try a 3/16 bit.
Bee can get through 1/4 so that would be too big.
Per Michael Bush: For wire cloth, extrapolate to holes?
#8 - no bee can pass. pollen gets stuck.
#7 - as long as there are no bent wires, no bee can pass. Pollen falls through. Good for the bottom of a pollen trap to let the pollen fall into the tray.
#6 - worker bees can squeeze through (and will) but they have to wiggle and squirm a lot. Drones and queens cannot.
I have heard that bees can enter an opening as small as 3/16"
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