Hello Allen and Everyone, Until this year, my hives were plagued by the T mites. With the Russian bees T mite resistance has been very much publicized on Bee-L as well as in the general beekeeping press, my experience has been just the opposite. My Russian bees could carry lots of mites without the massive symtoms shown by other lines. Yet they collapsed just as fast as the others. That included all of my Russian stock including one very expensive breeder and several just plain expensive breeders. It should be noted that I don't treat for mites at all, no patties, no menthol, no oil, nothing. Maybe some of the favorable reports noted are from those that routinely treat for mites. Of course my local conditions might not be too favorable :>). But before switching over to a new line give them at least 2 years and watch what happens in your location with your type of management. Best Wishes Dennis