" EPA-recommended treatment levels of 5 ml at 3–5% of OA in sugar water"

There is a world of difference between subliming oxalic acid and pouring a sugar water solution of oxalic acid over the bees.  We all know the latter causes damage to brood and likely some damage to adults and the queen.  That is why you should not do a dribble more than once a year.  But pouring a solution over the bees is not the topic of this thread.  Are there any refs that actually show damage from a sublimation treatment?  I know of a case where a hive was treated by sublimation at four or five day intervals ten or twelve times with no obvious damage.  I suspect if you dribbled at that interval that many times you would have a dead hive.

Dick

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