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Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
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Fri, 8 Feb 2019 12:42:00 -0500
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work done in Hawaii studied the change in the viruses over time following introduction of mites. There are various strains 

> Varroa facilitates the dominance of certain strains, which is strengthened by the loss of strain diversity between 2009 and 2010 as Varroa became established on the Big Island

> Studies in the United Kingdom and New Zealand have found that DWV infections and colony collapse did not coincide with the arrival and establishment of Varroa, but there was with a 1- to 3-year time lag, which we also observed on Hawaii. This study shows that the spread of Varroa in Hawaii has caused DWV, originally an insect virus of low prevalence, to emerge. This association may be responsible for the death of millions of colonies worldwide wherever Varroa and DWV co-occur. 

> The global spread of Varroa has selected DWV variants that have emerged to allow it to become one of the most widely distributed and contagious insect viruses on the planet.

Martin, S. J., & al (2012). Global honey bee viral landscape altered by a parasitic mite. Science, 336(6086), 1304-1306.

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