Fuente: PubMed "apiculture" J Invertebr Pathol. 2026 Jun 27;218:108688. doi: 10.1016/j.jip.2026.108688. Online ahead of print.ABSTRACTDeformed wing virus (DWV) is the most prevalent and extensively studied Apis mellifera virus. The ectoparasitic mite Varroa destructor strongly influences DWV epidemiology and is associated with high colony mortality worldwide. In this study, the effectiveness of an organic (oxalic acid) and a chemical (amitraz) acaricide in reducing DWV load was evaluated. Twelve naturally infested colonies were divided into three groups: oxalic acid, amitraz, and untreated control. Varroa infestation levels and DWV titres were monitored every 1-1.5 months over an 18-month period, with DWV quantified using RT-qPCR. Both acaricides showed high efficacy (>90% efficacy); however, no significant reduction in viral load was observed during the acaricide treatment period. A general decline in viral levels was observed in all experimental hives during winter; however, untreated colonies exhibited higher levels, suggesting a subclinical infection. The re-emergence of varroa in the spring was followed by DWV titre increase in all groups. A positive correlation between mite infestation and DWV titres in adult bees was observed. These results highlight the complex DWV-varroa relationship and emphasize that continuous mite monitoring and control are essential to mitigate viral impacts and support colony health.PMID:42364905 | DOI:10.1016/j.jip.2026.108688