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Prouty, Cody; Jack, Cameron; Sagili, Ramesh; Ellis, James D.
Applied Sciences, 02/2023, Letnik: 13, Številka: 3Journal Article
Vairimorpha (formerly Nosema) apis and V. ceranae are microsporidian pathogens that are of concern for managed honey bee colonies. Multiple treatments have been proposed to be effective in reducing the prevalence and intensity of Vairimorpha spp. infections. Here, we test the efficacy of these products in one lab-based experiment and three field experiments. In the lab experiment, we found no reductions in Vairimorpha spp. prevalence (proportion of individuals infected with Vairimorpha spp.) or intensity (number of Vairimorpha spp. spores per individual), but we did find a decrease in honey bee survival after treatment with Fumagilin-B, Honey-B-Healthy®, and Nozevit Plus. The first field experiment showed increased Vairimorpha spp. intensity in colonies treated with Fumagilin-B and HiveAlive® compared to a negative control (sucrose syrup alone). The second field experiment showed a weak reduction in Vairimorpha spp. intensity after 3 weeks post treatment with Fumagilin-B compared to Nozevit. However, Vairimorpha spp. intensity returned to levels comparable to those of other treatment groups after 5 weeks post treatment and remained similar to those of other groups for the duration of the experiment. The final field trial showed no positive or negative effects of treatment with Fumagilin-B or Nosevit on Vairimorpha spp. prevalence or intensity. These findings raise questions regarding the efficacy of the products currently being used by beekeepers to control Vairimorpha spp. We argue that the observed reduction of Vairimorpha spp. is more likely relevant to the phenology of spore prevalence and intensity in honey bee colonies than to chemical treatment.
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