fumagillin

…an antimicrobial agent known as fumagillin that is commonly used to control Nosema species has been shown to affect the physiology of European honeybees at concentrations that are ineffective against N. ceranae, the most invasive of the microsporidian pathogens. Because honeybees raised in brood combs with high levels of pesticide…

…beekeepers also feed the drug fumagillin to reduce possible damage to the adult bees by nosema disease (see below Disease and pest control). The colonies need a sunny exposure and protection from cold winds. Some beekeepers in northern and mountainous areas wrap their colonies with insulating material in winter. A…

…feeding the colony the drug fumagillin.