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I am working on a beetle trap idea and need to know the proper size for the beetle entrance, large enough for them to get in but small enough to exclude the bees. I am thinking 1/8", since I think Michael Bush says bees can get through openings as small as 3/16", but am not sure.

I am also interested in whether to use drilled holes, or a narrow slot. Watching beetles in the hive it looks like they really like slots.
 

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1/8 " works for screened bottom boards
 

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82 colonies +/- mostly Langstroth mediums, a few deeps for nuc production
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What I have seen from most sources is that bees can go through 1/5 inch, that is what is used in pollen traps. SHB can go through 1/6 inch. That size wire is hard to find. Some bee supply companies have it by the foot.
 
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