Here in the states, a lot of the hobbyists are going treatment free. we are letting mother nature figure it out and find the bees with the right genetics to handle the mites. I believe it was India that decided when the mites first hit their country that they were not going to treat for mites. It took 2 years of losses for the bees to figure it out and find the bees, usually about 10%, that were able to survive. Now they are treatment free. I have been keeping bees for over 4 years now with no treatments. My losses are less than those that treat. My winter losses are very few, the biggest problem I have is making splits in the spring. The predators,dragonflies and birds, get my virgin queens, not losses from mites.
We lost most of our feral bees here. Now even they are coming back in large numbers, especially in areas with hobbyists. I reciently looked at a section of a bee tree that fell down with a lot of black comb in it and the hive was still very healthy. The bees completely covered the 12 inch opening, left on the still standing part of the tree, with bees. The section on the ground was 5' long of nothing but black comb filled with honey only.
See this thread.
Re: varroa control choices?
Here is the link from that thread:http://www.kirkwebster.com/index.php/collapse-and-recovery-the-gateway-to-treatment-free-beekeeping