Can you be a little more specific re: powdered sugar. How much, where, and how do you put it on them?
application is a PITA, if, you want to do a good job.
Doing as MB suggest, shaking some chuga on the top bars while they are in the box will not cover or even touch many bees, which is what the exercize is all about. The bees ahould have chuga on 'em, all o dem, or, as many as possible. The powdered chuga is sugar and the bees have a little feast, at least, if nothing else.
Really, you should pull ALL the frames, with bees clinging and sprinkle or sift some chuga on the whole shebang, both sides, for an effective application. That way you will get most of dem.
The exercize is better done if two peeps do it, one holdin', one siftin'. It's rather difficult to sift or sprinkle chuga by yourself without dropping the frame. Now you could devise a rest for the frame and do one side, flip it ovah, to do the other side.
The amount of chuge sprinkled is LIGHTLY. But again it's sugar and the bees will eat it so no harm will be done.
I have not read, or, heard about the shakin' out all the bees inna a seperate box to sprinkle them with sugar. That would probably work but does require manipulation of ALL the frames also. Seems to me to be just as effective to sprinkle the chuge on the bees and frames while holdin' em
and probable less traumatic for the bees.
You should also have screened bottoms with a clean slide out board to check, before and after, the mite drop. After, you should see a significant increase of mites.
Make no mistake, doing a complete sugar application, correctly, is quite an exercize, and, will require at least one hour or more if your hives are highly populated with hopefully, gentle bees. If your bees tend to be defensive and aggressive add that to the PITA factor.
The liquid Sucrocide treatment should be done in the same manner.
Personally, I use standard beekeeping practices.