Do european beekeepers using the "optimal" OA dosage apply more than one treatment per year?
I've both trickled and vaporized oxalic acid. I can't say from my own observations that one treatment method is "harder" on the bees than the other. I vaporized 3 times in late summer and dribbled once in early November. I did notice more dead bees at the hive entrances after 1 trickling than I did after 3 vapor treatments and I attribute those deaths to the treatment, but I don't know if I might have killed (drowned?) just as many bees by trickling plain sugar syrup into the hive. Perhaps some bees flew off after vaporizing and died in the field. I don't know.
In other words, there were a lot of controls missing from my "experiment". Then again, it wasn't an experiment, it was a desperate last-minute attempt to knock down mites and save my bees before winter.
I don't know how my OA solution compared in strength to the recommendation cited by Jim above. I'll do that. I do know that the OA dribble treatment I followed is recommended once per year. I take that to mean that once is hard on the bees but worth the cost but twice (or more) will be bad for the bees and not worth the cost.



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