L.S.,
If I want to treat swarms/shook swarms for mites I spray with a 3% oxalic acid solution. This works well but might make bees acidic for a longer time, which might be not to good.
Does anyone use formic acid to treat swarms in their cage/swarm box?
Can you spray weak solutions of formic on bees and get a mite drop?
Or use a kind of evaporation shock treatment?
atb
Lennard
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