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I would say dribble OA only in late summer when bees can clean each other fast enough.

35grams oxalic acid x 1000grams warm water (1liter) x 1000grams sugar (1kg)
Dribble with a syringe 35ml on a normal and up to 50ml on a strong hive.

Don’t kip leftover solution for the next treatment always use fresh mixture. When mixing OA and sugar it starts a chemical reaction and after a while (week or so depends on temperatures) the liquid is POISON to bees.

With acid in their stomach bees have a much shorter live, that’s why I never dribble OA on winter bees. IMO it’s too cold now for the liquid acid.
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