Oxalic acid vaporization

Oxalic acid is another organic acid used for varroa mite control, particularly effective during broodless periods in late fall or winter when mites are phoretic (riding on adult bees and not inside brood cells). Oxalic acid is typically applied by vaporization using a vaporizer device that heats oxalic acid dihydrate into a vapor within the hive. The vapor crystallizes into fine particles that are toxic to varroa mites. Safety equipment, including a respirator mask and gloves, is essential when vaporizing oxalic acid as the fumes can be harmful. Oxalic acid is most effective when colonies are broodless because it does not penetrate capped brood cells. It is considered an organic treatment and is valuable for late-season mite control to ensure healthy winter bees. A 12V battery is often used to power the vaporizer in remote apiary locations.