Re: Queen cells not hatching
Don't remember this problem at all pre varroa, which in my country was year 2000.
The last two seasons had quite a bit of what Makin Honey describes, more so this last season. Thought it was just me, then found beekeepers all over my country are having the same issues, some very discouraged beekeepers.
What is it? Don't know, but what's changed is increasing bee diseases, and neonicitinoid use. As per others, I've found that if the cells are not put out till the very last minute, which requires use of an incubator cos the odd one will hatch, the problem is less.
This has made me question my handling of queen cells while putting them out, but can't really find anything wrong. Not doing anything different than I've always done, which used to get virtually 100% hatch.
44 years, been commercial, outfits up to 4000 hives, now 120 hives and 200 nucs as a hobby, selling bees. T (mostly).