>I've read that small cell bees emerge at 19 days is this true?If this is true would I still have to do three treatments.
You still have mites in the brood. What are you treating with? Powdered sugar? Oxalic acid? Other?
>The problem is that no one has sat and logged the
process of a queen laying eggs on even one
complete side of a frame, and tracked those cells
to emergence on anything other than a hit-or-miss
basis, even though this is something that can be
done with nothing more than an observation hive
and a camera.
One complete side would be a lot of work, but several of us have done quite a number of cells and all have reported the same results. I've done it on several occasions always with the same results. You are correct, it only requires an observation hive and taking the time to note when the egg was layed, when it was capped and when it emerged. It's not rocket surgery.
>I'm regressing them this hive had 40+ mites on A 24hr sticky board test
If they aren't regressed yet, it might be worth knocking them down, but if you have 40+ in that hive and 4 to 7 in the others, you may want to raise a new queen for the one with 40+. Maybe they are less hygenic or maybe they are not drawing the smaller cells very well. Either way a new queen would probably make a difference.