Mike:
This is a little different then when the bees chew out
granulated honey in crowded conditions to make room and
spit out front.

Pollen does get thrown out from time to time but not often
as it is necessary for brooding. So question: In the corner
or north side it is on: Did it get wet and mold to make for
cleaning out? Did it get moth larvae into it being on side
where small slit or opening could be to get bees to want to
clean the pollen out? Other small insect burrowing into it
to make the bees want to clean it out? Is it outside frame
and next to wall? Just thinking about what you  wrote.

Regards,

Dee A. Lusby


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