Google search http://www.google.fi/search?hl=fi&q=varroa+tolerant+bees&meta=http://www.funpecrp.com.br/gmr/year2002/vol2-1/gmr0040_full_text.htmVarroa-tolerant Italian honey bees introduced from Brazil , 2002
in Brazil an isolated population of Italian honey bees has been kept on an island since 1984 without treatment against this mite. The infestation rates in these colonies have decreased over the years. We looked for possible varroa-tolerance factors in six Italian honey bee colonies prepared with queens from this Brazilian island population, compared to six Carniolan colonies, both tested at the same site in Germany..............
In spite of the apparent adaptation of this population of Italian bees in Brazil, we found no indication of superiority of these bees when we examined the proportions of damaged mites and the varroa-infestation rates, compared to Carniloan bees kept in the same apiary in Germany.Varroa-Tolerant Honey Bees Are a Reality Finsky: In the end half of 1990-decade it has wroten that it is easy to select varroa tolerant beestock. You just pick them. Now 10 years have gone and we are not so positive with that question. http://gears.tucson.ars.ag.gov/rf/abj/varroa.html
"In the November 1998 issue of The American Bee Journal (pp. 828-832) we reported the results for the first two years of our effort to develop a Varroa-tolerant population of honey bees (Erickson et. al., 1998). "
We have now maintained this Varroa-tolerant honey bee population since November, 1994
via selective breeding, queen mating in isolation, and conventional beekeeping practices, without the use of any other mite control strategies. All colonies were last examined and sampled on July, 27, 1999. Three colonies were queenless, and three others had evidence of a break in brood rearing and new supersedure queens. Two colonies, although vigorous, had visible evidence of Varroa infestation. All remaining colonies appeared Varroa free.
---- where are they now 10 years later?
**************************Wednesday 21 August 2002, Ne ZealandLatest results from varroa research show building a stock of varroa-tolerant bees is possiblehttp://www.maf.govt.nz/mafnet/press/210802bee.htm
***********************Canada 2004Manitoba Project for Varroa Tolerant Bees
The Manitoba Queen Breedersâ€™ Association is entering its fourth year of work with an ultimate goal of finding varroa tolerant honeybees. Funding has been secured for our fourth summer of research.http://honeycouncil.ca/users/Folder.asp?FolderID=4753&NewsID=475
*******************************Honey bees of the Arnot Forest: a population of feral colonies persisting with Varroa destructor in the northeastern United States, 2006http://www.edpsciences.org/articles/apido/pdf/2007/01/m6063.pdf
Abstract - Feral colonies of European honey bees living in the Arnot Forest, a 1651-ha research preserve in New York State, were studied over a three-year period, 2002 to 2005. This population of colonies was previously censused in 1978. A census in 2002 revealed as many colonies as before, even though Varroa destructor was introduced to North America in the intervening years. Most colonies located in fall 2002 were still alive in fall 2005. The Arnot Forest colonies proved to be infested with V. destructor, but their mite populations did not surge to high levels in late summer. To see if Arnot Forest bees can suppress the reproduction rate of mites, colonies of Arnot Forest bees and New World Carniolan bees were inoculated with mites from an apiary and the growth patterns of their mite populations were compared. No difference was found between the two colony types. Evidently, the stable bee-mite relationship in the Arnot Forest reflects adaptations for parasite (mite) avirulence, not host (bee) resistance.
********************http://www.squidoo.com/bee_breeders_initiative/Posted January 09, 2007, California
There continues to be promising research in Varroa tolerance and resistance through finding and selecting "survivor" stocks, and also by looking at the biology of both the mite and the bee to understand interactions that reduce the virulence of Varroa in stocks. An example of the former is the introduction of Russian (Primorski) stock into the U.S., and the latter is the work on Varroa-sensitive hygiene (VSH), previously called suppressed mite reproduction (SMR). Some of these efforts are cataloged at the queen production, breeding and producer lens.