We’ll that’s not correct or the previous statement ref the US, there’s a huge number of breeders/groups working on bees showing tolerance. In fact you can even find them commercially available in the UK. How good they are in practice or real world situations and at the hands of many beekeepers is another matter! But there’s work being done. Personally I’ll look forward to the day they are readily available from the larger breeders/groups and importers. On its own I doubt it’ll be enough on course but at least another tool in the armoury. Ian
There was a few year ago research in USA, where it was tested the varroa tolerance between resistant and non resistant queens. (UK does not have such reseaches).
The result was, that there is a statistical difference between them . The difference was 10%. When you count, that varroa multiply itself in one month 100% , difference of 10% has no practucal value.
About resistant hybrids the researcher said, that there was no difference.
The researcher told too, that when he got tolerant queens from the breeder, some queens were hybrids. Propably the breeder does not even know, which of his queens are tolerant or non tolerant.
I have met only 2 research about tolerant queens, and boath say that hybrids are nontolerant.
We can understand, why the idea of testing tolerancy is not popular. There are tens of queen breeders, who sell tolerant queens and say that free mate queens are half tolerant too. You are ex researcher if you touch wrong things.
It is wonder, that hobby beekeepers have so much tolerant bees but in loss research they have huge losses annually. They do not know why the hives died.
Best reseachers in USA recommen to use treatments, but the beekeepers do not mind.
Then we have Pargyle in The UK, who says the his friends have tolerant bees, and as far he knows, they do not loose much colonies.
It seems that the most important thing is that you do not loose your belief. It is more value than some hives. If a hive dies, at least it did not die by varroa.