Residual Fumagillin Activity in Sugar Syrup Stored by Wintering Honeybee Colonies

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Abstract
Experiments are described which show that the level of Nosema infection was satisfactorily reduced by feeding colonies in October with Fumidil B (but not with Nosemack). Other experiments show that syrup containing fumagillin, fed to colonies in the fall and overwintered in the colony, was effective the following summer in reducing the level of Nosema infection in caged bees.