[bspammer]

The article you linked lists a bunch of downsides to powdered sugar: it doesn’t kill the mites it just encourages the bees to brush them off, it has reduced effectiveness when it’s humid, it doesn’t work on mites that aren’t actively on a bees body, and it has to be applied regularly.

[lostlogin]

And it won’t worked on capped brood, so you have to dust them repeatedly.