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Minimum Wire Mesh Size to trap Small Hive Beetles

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Hi all. An opening of .135 should be big enough to allow Small Hive Beatles to fall through, correct?
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North Georgia USA Zone 7b Mutts and Carniolans in Langs.
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Your in the ballpark here. Most commercial screened bottom boards are too small for an adult beetle to easily fall through. Might be able to crawl through on the diagonal, but that is not what you want. The scrounged screen I recently used is #6 mesh, .166 minus the wire diameter of .028 so .138 opening. Nothing scientific just using what I had that is close to what is needed.

Oh, welcome to Beesource!
 

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I think that such a large 'open' screened area would not be in the bees' best interest. Bees, when necessary, engage in thermoregulation of their brood area. Having free air movement through the bottom of that long Lang will likely make it harder for the bees to control the temperature.

Its not just heating the hive in cold weather, bees also set up their own "swamp cooler";) system by hauling in water to evaporate and fanning to control air movement/evaporation when its hotter than what they want.

But you could have a screen floor that had a (removable) solid surface underneath it.
 

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Discussion Starter · #5 ·
It will be totally enclosed. there will be a 3/8" gap from the bottom of the frames to the mesh then about 1/2" to the pull out trays. All covered by at least 3/4" wood floor. I'm just concerned about the bees having to move around over the mesh.
 

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There are lots of beekeepers whose hives have a bottom board 'floor' using #8 screen.

The presence of the screen hasn't been reported as a problem. The controversy that arises is whether or not the screen should be closed off or not.
 
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