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Author Topic: Formic acid and mites  (Read 770 times)
House Bee
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Posts: 110

Location: Malaysia

« on: August 27, 2006, 10:43:53 AM »

I recently used formic acid (100%) to kill varroa mites. Fill an open top aluminium can (Cola can etc) with about 50ml formic acid and place into hive, cover with a mesh to prevent bees from dropping in. The effect is fantastic. However, a serious problem that I cant solve is queen tend to abscond if the colony is weak. I believe this is due strong odour that forced the queen to leave. I tried to cage the queen while placing acid but some queen died in the cage. Anyone has experience about using this chemical and what is the best solution? Maybe I should reduce formic acid to 70% or etc?

Michael Bush
Universal Bee
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Gender: Male
Posts: 13622

Location: Nehawka, NE

« Reply #1 on: August 27, 2006, 02:23:12 PM »

The studies I've seen say that losing queens is one of the side effects.  I haven't had the problem with Oxalic acid vapor.

Michael Bush
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"Everything works if you let it."--Rick Nielsen
Super Bee
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Gender: Male
Posts: 2791

Location: Finland

« Reply #2 on: August 27, 2006, 03:27:30 PM »

When you heat oxalic acid, it turns to  formic acid.
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