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Date: | Thu, 11 Jan 2024 09:57:29 -0600 |
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>The mite density numbers reported from "resistant" colonies presumably produced by natural selection are not impressive.
Most of the contemporary data that I am aware of that has been collected on this score has been by Dr. Martin.
In the present 'Parallel evolution of Varroa resistance in honey bees: a common mechanism across continents?' article under consideration it is noted:
'In the Africanized colonies, which are all resistant, average worker-brood infestation rates have fallen from 20% during 1996–1998 to 4% in 2018–2019 (figure 1h). Additional preliminary data from UK-resistant colonies (n = 44) collected by the authors and found that brood infestation averaged at 6% and was not significantly different to Africanized colonies in 2018/2019 (U = 460, p = 0.052).'
'Interestingly, we found that worker-brood infestation has fallen significantly (U = 123, p < 0.0001) from 20% to just 4% over the past two decades in resistant colonies in South America (figure 1h) currently the only location with long-term data.'
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