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Api-Bioxal Oxalic Acid 35 Grams


This 35g package of Api-Bioxal is an oxalic acid Varroa destructor mite treatment developed specifically for honey bees. It is registered by the EPA under a label developed by the USDA.

Api-Bioxal can be applied either via the dribble or vaporization/sublimation method. You can also spray package bees following the instructions on the Api-Bioxal label.

This 35g package can treat 20 colonies using the dribble method and 35 colonies using the vaporization/sublimation method.

Instructions for the dribbling method:

  • Dissolve oxalic acid in 1:1 sugar syrup. The recommended ratio is 35g dissolved into 1L of sugar syrup.
  • Dribble 5ml of the syrup/oxalic solution onto the bees in each occupied bee space with a syringe or an applicator.
  • Maximum dose: 50ml per colony.

Instructions for the vaporization/sublimation method:

  • Seal the entrance and cracks of the hives with tape.
  • Use the vaporizer following the manufacturer’s directions.
  • Use only 1g of Api-Bioxal per brrod chamber.

Treating against varroa is necessary to keep honey bee colonies healthy and strong. However, treatment is not recommended unless you know your varroa mite count is over the treatment threshold.


  • Quick facts and tips about Api-Bioxal:
  • Oxalic acid works best on colonies with little to no brood.
  • Do not treat during honey flows; wait 14 days after treatment to add honey supers.
  • Always wear a protective mask, gloves, glasses, and long sleeves when mixing and applying oxalic acid.
  • Do not perform multiple treatments on each generation of summer or winter bees.
  • Treat all colonies in the apiary at the same time to avoid reinfestation.

Warning: Use a protective mask, gloves, glasses, and long sleeves when mixing and applying oxalic acid.

Api-Bioxal has a 5-year shelf life.

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