> Emne: Re: [BEE-L] Mentholated Blue shop towels for tracheal
> mites
> Opposite to oxalic acid it also kills Varroa in
> the capped cells.

> There were reports of varroa kills in capped cells when beekeepers were
> using 85% formic but were also many brood and queen kills which is why
> beekeepers went to the lower percent.

Yes it can be aggressive in the hive, but it is in my experience related to
wrong use (to hot weather = to much formic released) we recommend that the
temperature is not higher than 20 degrees Celsius and not less than 15
degrees Celcius.

we are using 85% concentration in formic acid pads made from 1cm thick wood
fibre plates soced with 250 milli litre. It is then sealed in a plastic bag
and when used then cut open with 2x2 cm square slices a frame. pads must be
on seven days. The 2x2 cm slice and temperature 15 to 20 deegres celcius
allows 7 to 10g a day to be released.

85% formic acid is also used in vaporizers.  60% formic is used as a free
acid treatment, dripping 2 ml 60% formic 4 days in a row.

> Does 65%  formic acid kill varroa in capped cells ?

not that I will count on that, I use always 85% formic my self. I have lost
a few queens due to formic treatment, but I have always some spare queens
around to replace with.

> Efficacy with formic acid is nowhere near the efficacy of chemical strips
> (98%) research has shown as too many variables exist (temp , humidity &
> dosage which is hard to figure out ) .

Well It works here. The fact is that we have used it since the Varroa first
showed up.

Best regards
Jorn Johanesson

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