I treated some test hives over the past 2 months for Varroa mites using a vaporizer. One thing I did notice on subsequent inspections was the decrease in the amount of SHB in the treated hives. Not sure if it was the acid but there was a noticable decrease after the treatments. All 3 hives had plenty of SHB's prior to treatment, controllable but there were many.
On the 2 hives that I had vaporized, the count was only 5 or 6 seen when doing the inspection where on the untreated hive, the count was probably 30-40 plus.
Not sure if anyone has had this same experience.
We haven't had any temps yet below 45F and the daily temps have been 70-80F so I don't think that the temp had much to do with the hives with the fewest SHB.