35g Api-Bioxal Oxalic Acid

Oxalic acid for mite control is used early spring or late fall when little or no brood is present to treat varroa mites.

  • Item Code: OA35
  • 8.95 USD$8.95

Varroa destructor mites (an external parasite) weaken honey bees and can lead to the demise of your hive if left untreated. Api-Bioxal is an oxalic acid treatment that is approved by the E.P.A. under a label developed by the USDA making it a safe, effective solution for killing mites.

This package treats 20-35 colonies depending on the method used. Need a different quantity? We also sell a 350 g Api-Bioxal Oxalic Acid (200-300 colonies)


  • This 35g package can treat 20 colonies using the dribble method and 35 colonies using the vaporization/sublimation method
  • Api-Bioxal can be applied either via the dribble or vaporization/sublimation method (explained below). You can also spray package bees following the instructions on the Api-Bioxal label.
  • Treating against varroa is necessary to keep honey bee colonies healthy and strong. However, treatment is not recommended unless you know that your varroa mite count is in excess of the treatment threshold. You can learn more about the treatment threshold from a trusted resource done by Ontario Tech Transfer Varroa Mite Treatment Threshold and Recommendations
  • Api-Bioxal has a 5-year shelf life
  • Not available in California

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 1g of Api-Bioxal per brood chamber.

Quick facts and tips about Api-Bioxal:

  • Oxalic acid works best on colonies with little to no brood.
  • 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 protective mask, gloves, and glasses, and long sleeves when mixing and applying oxalic acid.

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