I really work for getting bees that can handel the varroa mite themselves. You get results when you do, but it’s extra work and sometimes it’s difficult to interpret what you see. And you loose some bad bees. And some not so bad bees don’t give any honey – and you shift the queen in those. That’s the two most important results from such a work.
I got a good report in the discussion forum of VSHbreeders.org. That’s encouraging.