Hi Bill,
See: http://www.algonet.se/~beeman/index-f.html
Click onto research - varroa.
You will be able to read about Formic and Oxalic.
Whilst this thread is running:
How much metal corrosion is caused by these two acids in bee hives? - I have seen metal entrances that have a fair bit
of damage after formic acid treatment.
Peter
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