What is a common treatment for Nosema?

Fumagilin-B is a widely recognized treatment specifically for Nosema, a parasitic infection that affects honey bees, primarily Nosema apis and Nosema ceranae. Fumagilin-B contains fumagillin, which is effective in inhibiting the growth of the Nosema spores within the bee's gut and helps alleviate the symptoms associated with the infection. This medicated solution is generally mixed with sugar syrup and provided to the bees, allowing for a direct intake that targets the problem where it occurs.

In contrast, other options may not directly address the underlying issue of Nosema. Powdered sugar, while sometimes used as a method for mite control, does not target the Nosema pathogen itself and is not an effective treatment for the infection. Apivar is a treatment specifically aimed at Varroa mites and does not have any effect on Nosema. Disposing of old frames can be part of general hive management or hygiene practices, but it won’t treat an active infection of Nosema in the bees present. Thus, the most appropriate and effective treatment listed for Nosema is indeed Fumagilin-B.