Hi FS,
Box was rammed so very odd. On "the other forum" a few people reported similar things and suggested the cold can definitely do this. Ho hum - next time !
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Did you cage the queencells on day 11 or 12 in readiness for emergence?
I wonder if the bees lost contact with the queencells and then ignored them. - You usually see bees hanging around queencells making contact with them and they presumably monitor the temperature and adjust accordingly and can't do that with a caged cell.