> This spring she is laying a good solid egg patern, but none of the eggs hatch
It’s hard to answer this question because some critical information is missing. Do the eggs disappear or do they just lay there and nothing happens? If they just lay in cells, the question becomes has the biological process inherent in egg maturity somehow stopped. Low brood nest temperature, for some reason, is a likely suspect in that case.
Otherwise an egg that made it to a cell after its development and then didn’t mature to a larva was somehow dead on arrival. I’ve never heard of a dead egg laying queen before, but I guess anything is possible.
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