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A derived honey bee stock confers resistance to Varroa destructor and associated viral transmission
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A derived honey bee stock confers resistance to Varroa destructor and associated viral transmission
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Journal Article
A derived honey bee stock confers resistance to Varroa destructor and associated viral transmission
2022
Overview
The ectoparasite
Varroa destructor
is the greatest threat to managed honey bee (
Apis mellifera
) colonies globally. Despite significant efforts, novel treatments to control the mite and its vectored pathogens have shown limited efficacy, as the host remains naïve. A prospective solution lies in the development of
Varroa
-resistant honey bee stocks, but a paucity of rigorous selection data restricts widespread adoption. Here, we characterise the parasite and viral dynamics of a
Varroa
-resistant honey bee stock, designated ‘Pol-line’, using a large-scale longitudinal study. Results demonstrate markedly reduced
Varroa
levels in this stock, diminished titres of three major viruses (DWV-A, DWV-B, and CBPV), and a two-fold increase in survival. Levels of a fourth virus that is not associated with
Varroa
—BQCV—do not differ between stocks, supporting a disruption of the transmission pathway. Further, we show that when decoupled from the influence of
Varroa
levels, viral titres do not constitute strong independent predictors of colony mortality risk. These findings highlight the need for a reassessment of
Varroa
etiology, and suggest that derived stocks represent a tractable solution to the
Varroa
pandemic.
