HiveMeadow
Medivet Fumagilin-B
Full specification5 entries
Active Ingredient
Fumagillin (dicyclohexylamine bitartrate)
Package Size
9.5 g (standard), bulk sizes available
Form
Water-soluble powder
Target Pathogen
Nosema apis / Nosema ceranae
Application Method
Mixed into 2:1 sugar syrup for feeding
Medications/Treatments · ranked 70 of 99

Medivet Fumagilin-B

Medivet · ★★★★☆ 4.3 / 5

Medivet Fumagilin-B remains a staple treatment for beekeepers managing Nosema infections, offering a reliable way to reduce spore loads when mixed correctly into syrup feed.

  • Controls Nosema spores
  • Trusted apiary treatment
  • Easy syrup mixing
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  • Scored from the specification and owner reports
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Who it fits
  • Effective at reducing Nosema spore counts in treated colonies
  • Easy to mix into standard 2:1 sugar syrup
  • Trusted, long-standing brand in beekeeping medication market
  • !Requires precise mixing ratios to avoid under- or over-dosing
  • !Does not eliminate Nosema completely, only suppresses spore levels
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The verdict

Medivet Fumagilin-B remains a staple treatment for beekeepers managing Nosema infections, offering a reliable way to reduce spore loads when mixed correctly into syrup feed. While it requires careful handling and timing around honey flows, its long track record and consistent performance make it a trusted choice for both hobbyist and commercial apiaries.

Bench scorecard

Derived from this product's specification, features and owner reports.

Build 84
Handling 87
Value 87
Lasts 84

Key features

  • Active ingredient: Fumagillin (as dicyclohexylamine bitartrate)
  • Used for control of Nosema apis and Nosema ceranae in honeybee colonies
  • Water-soluble powder mixed into sugar syrup feed
  • Available in 9.5g and larger bulk packaging for commercial beekeepers
  • Health Canada / veterinary approved formulation for apiary use
  • Typically applied during fall and spring feeding cycles

Living with it

What works

  • Effective at reducing Nosema spore counts in treated colonies
  • Easy to mix into standard 2:1 sugar syrup
  • Trusted, long-standing brand in beekeeping medication market
  • Available in package sizes suitable for hobbyist and commercial beekeepers
  • Supports overall colony strength going into winter

What to watch

  • Requires precise mixing ratios to avoid under- or over-dosing
  • Does not eliminate Nosema completely, only suppresses spore levels
  • Must be stored properly (cool, dark) to preserve potency
  • Withdrawal period needed before honey flow/harvest
  • Pricier per treatment compared to some generic fumagillin alternatives

The full review

Medivet Fumagilin-B is a specialized antibiotic treatment formulated specifically for beekeepers to combat Nosema disease, a widespread fungal infection affecting honeybee colonies caused by Nosema apis and Nosema ceranae. This microscopic parasite invades the digestive tract of adult bees, impairing their ability to properly digest food and significantly shortening their lifespan, which can lead to weakened colonies, reduced honey production, and in severe cases, complete colony collapse. Fumagilin-B contains fumagillin, the active pharmaceutical ingredient derived from the fungus Aspergillus fumigatus, which has been proven effective in controlling and suppressing Nosema spore levels within bee populations when administered correctly during appropriate treatment windows, typically in fall and spring feeding cycles.

Beekeepers typically administer this treatment by mixing the powder into sugar syrup, which is then fed directly to the colony through standard feeding equipment such as frame feeders, hive-top feeders, or entrance feeders. The medicated syrup allows the fumagillin to be distributed naturally throughout the hive as bees share food via trophallaxis, ensuring broader exposure across the worker population and helping to reduce overall spore counts within the digestive tracts of infected bees. Proper dosing is critical, as underdosing may fail to control the infection while overdosing can stress the colony, so beekeepers are encouraged to follow label instructions precisely and integrate treatment timing with seasonal management practices, particularly before overwintering when Nosema pressure tends to intensify due to confinement and reduced foraging activity.

Fumagilin-B has become a staple in integrated pest and disease management programs for commercial and hobbyist beekeepers alike, valued for its targeted action against Nosema without broadly disrupting other aspects of hive biology when used as directed. It is commonly stocked alongside other essential beekeeping health products such as mite treatments, hive beetle controls, and nutritional supplements, forming part of a comprehensive approach to colony health maintenance. Many beekeeping suppliers offer it in various package sizes to accommodate operations ranging from a few backyard hives to large-scale commercial apiaries, making it accessible for beekeepers seeking to protect their investment in healthy, productive colonies through proactive Nosema management.

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