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Global pollinator declines are a major concern. Varroa destructor mites impact honeybee health by spreading Deformed wing virus (DWV). This study reveals DWV genotype B persists independently of mite levels, unlike genotype A.

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Area of Science:

  • * Entomology
  • * Virology
  • * Apiculture

Background:

  • * Global pollinator declines pose significant ecological and agricultural risks.
  • * Emerging infectious diseases threaten managed honeybee (Apis mellifera) populations.
  • * The ectoparasitic mite Varroa destructor is a primary vector for detrimental RNA viruses like Deformed wing virus (DWV) in honeybees.

Purpose of the Study:

  • * To investigate the role of vector transmission by Varroa destructor in the prevalence of Deformed wing virus (DWV) genotypes A and B.
  • * To determine the influence of mite infestation levels on the relative abundance of DWV-A and DWV-B within honeybee colonies.
  • * To elucidate the factors contributing to the increasing global prevalence of DWV-B.

Main Methods:

  • * Experimental manipulation of Varroa destructor mite loads in honeybee colonies.
  • * Longitudinal monitoring of Deformed wing virus (DWV) genotypes A and B RNA loads over 10 months.
  • * Correlation analysis between mite infestation levels and viral loads for each DWV genotype.

Main Results:

  • * Deformed wing virus (DWV)-A accumulation was positively correlated with Varroa destructor mite numbers and largely absent without mites.
  • * Deformed wing virus (DWV)-B maintained high loads in honeybee colonies irrespective of mite infestation levels.
  • * DWV-B demonstrated persistence and high viral loads even in mite-free or treated colonies, indicating a vector-independent advantage.

Conclusions:

  • * The increasing prevalence of DWV-B is not solely driven by selective pressure from Varroa destructor mite vectoring.
  • * DWV-B possesses an intrinsic ability to persist and replicate at high levels within honeybee colonies, independent of mite presence.
  • * The interaction dynamics between Varroa destructor mites and DWV genotypes have significant implications for honeybee health and potential viral spillover to other pollinator species.