>>The action of oxalic acid
is systemic where the bees consume the oxalic acid-sugar syrup and the
varroa that feed on these bees then die.

Oxalic acid has been considered a contact treatment, the idea that has been given to me is the syrup is poured on the bees and the oxalic is dispersed as the bees naturally move around within the hive, killing mites on contact.

What it is about the Oxalic that kills the mites, I dont know

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