Having a read around can't find much in the way of statistics only that they only usually mate when the temps above 20c got 2 hives with queens in making one should have hatched today at the latest the other hive should hatch theirs next sat latest.
It is more than likely they'll mate properly or am I just hoping? What's the pass/fail rate?
It is more than likely they'll mate properly or am I just hoping? What's the pass/fail rate?