Dick wrote: "To me OVA is not particularly attractive to someone with under five hives.  There are other good alternatives that do not cost much in $ or time compared to the equipment set up and cost of OVA equipment." My oxalic evaporator cost nothing!  It's a length of copper pipe that I had in my shed with one end blocked with a stick to use as a handle. The other end is squashed so that it fits into a hive entrance.  Heat is applied with a small camping gas stove. Chris  

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