24 hours after treatment with 1 gram oxalic acid vapor applied with a Provap 110V. Dead mites, to many to count, very effective in my hives. The pic is about 2.5 square inches of hive bottom, the entire bottom had a bazillion mites.
Mr Van 'this topic' ties in with the topic which is posted in disease and pest control "Varroa checks" along with the other topic in general beekeeping "Varroa Check >Spin-off<" A triangle brother and sister of topics which tie into each other. If you will study each of these carefully,. I am of the opinion, or at least have the theory, you are right about the 1 gram per box treatment.
The trick in my opinion, and I may stand alone in this, is the chart treatment schedule that CoolBees placed for our viewing. I have strict belief that Alen,
CoolBees,
beeboyb01, along with
rast, along with others, are on to good things. You're not incorrect in your dosage in my opinion. Scheduling may be the key?