![]() ![]() This is done despite knowledge that the treatment does not penetrate capped cells, where most of the mites reside. Typically, when supers are on, there’s also brood, and in practice many beekeepers have already been applying oxalic acid to colonies when there is ample brood present. ![]() In 2021, the Environmental Protection Agency announced that the oxalic acid product label, which dictates legal usage, now accommodates application while honey supers are on. Some beekeepers report problems with queen loss after formic treatment, especially in hot weather, leaving them looking for other options. ![]() Formic acid is also approved for use while honey supers are on, but it is not advised for small or weak colonies. Hopguard is approved for summer use, though efficacy is purportedly dubious. Though widely known to be most effective in broodless colonies, some beekeepers might feel squeezed in the summer by high mite levels, high temperatures, and maybe a dash of poor planning. in 2015, oxalic acid has become a standard method of varroa management. ![]() Since its approval for use in Canada in 2005 and the U.S. New research shows that applying oxalic acid vapor in the brooding season is a preventative measure, at best - if you stick to the label rate Plain Talk Beekeeping: The Basics … and then some. ![]()
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