Limerock is mined here in the area of west central Florida where I live and
is used for a number of things including unpaved roads. Once it is graded
and compacted it becomes hard like concrete. From the standpoint of the SHB
I would think it would be extemely hard for the larva to dig down into it
to pupate once it was compacted, however I don't know how far they would
crawl to get to soft soil.I don't think there would be and advantage or
disadvantage as far as varroa are concerned.

Obviously you can drive on it so there would be no problem with getting a
truck to the hives. It does become slippery and somewhat soft when it rains
but dries and gets hard fairly fast after the rain is over so unless you
work your bees in the rain that shouldn't be a problem.

From the heat standpoint I think bare sand gets to a higher temp than does
the limerock and from the aesthetic standpoint I think anything that in not
of the norm for the area whould look out of place.

Just some quick thoughts

Ed

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