Fumagillin has been used to successfully control
N. apis; however, we found that treatment of colonies with fumagillin did not reduce N. ceranae
levels significantly when colonies were re-examined and did not result in significantly higher
winter survival with the untreated hives having a slightly higher survival.

Our studies have found that treatment with fumagilin in the fall and pollen supplement feeding in
the winter did not result in a decrease in N. ceranae levels. Furthermore, the survival of the
colonies was not increased significantly when treatment or feeding was administered suggesting
that regardless of N. ceranae levels, treatment may not be effective.

We have observed strong colonies (determined by frames of brood, adult bee population, and
surplus honey production) that have very high levels of N. ceranae, and these colonies have
thrived and showed no symptoms of collapse as previously reported by Spanish researchers

Infection Cycle, Transmission Mechanisms, and Management of Nosema ceranae in Apis mellifera Colonies
Brenna Elizabeth Traver

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