From http://vshbreeders.org/forum/showthread.php?tid=145

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Consider this taken from a Baton Rouge report--------

Submitted to: Journal of Apicultural Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 15, 2012
Publication Date: July 2, 2012
Citation: Danka, R.G., Harris, J.W., Villalobos, E. 2012. Varroa 
destructor resistance of honey bees in Hawaii, USA, that express various 
levels of Varroa sensitive hygiene (VSH). Journal of Apicultural 
Research. 51(3):288-290.

Interpretive Summary: There is a large industry for production of honey 
bee queens in Hawaii, USA, that now is threatened by Varroa mites. The 
few miticides that commonly are used to manage mites can interfere with 
queen rearing and sperm production, and so can be problematic for queen 
production operations. We determined the usefulness of mite-resistant 
bees for managing mites. The bees were bred for a resistance trait known 
as Varroa sensitive hygiene (VSH). A commercial queen breeder 
established 30 colonies that had either 0%, 50% or 75% of the genetics 
for VSH. We sampled the colonies every two months to monitor the density 
of Varroa mites and to measure the population of brood. Individual 
colonies that reached a threshold density of mites (10 mites per 100 
bees) were removed from the experiment and treated with a miticide. We 
found that Varroa mites were significantly suppressed only in the group 
of colonies with 75% VSH. Six months after colonies were formed, all 0% 
and 50% VSH colonies required treatment. In the 75% VSH colonies, 
average mite densities increased to 5 mites per 100 bees at 4 months and 
then decreased to 0.5 mites per 100 bees at 8 months. Brood populations 
were smaller in the 75% VSH colonies than in the other groups. This 
information provides initial guidance for using genetically resistant 
bees to manage Varroa mites in the tropical conditions of Hawaii. More 
than half of the genetics for VSH are necessary to significantly 
suppress mites, and further breeding to retain large colonies is required.
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If a daughter from a pure VSH mother mates with drone with zero VSH is 
the colony back to ground zero on mite control?

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