Api-Bioxal is the only oxalic acid-based treatment approved by the E.P.A. in the United States. You can apply it during various periods of the year. As winter is probably the best period to use oxalic acid, it is important to remind you why this active ingredient will be more effective than any other mite treatment at this specific time of the year.
The EPA recently established an exemption from the requirement of a tolerance for residues of oxalic acid on honey and honeycomb. Click here to learn more about it.
The short days of winter can have an advantage for killing varroa, due to the absence, or scarcity, of brood in the hive. Varroa mites reproduce in honey bee brood, and most of their early life is spent there. As much as 80% of a colony’s varroa mites will, during periods of high honey bee and brood production, be contained within the cells of worker and drone cells.
1- According to the tolerance exemption issued by the EPA on February 23, 2021 and the label amendment accepted on April 30,2021. The user must be in possession of the supplemental label Rev. 12/17/20.
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Tammy Horn Potter