I saw trials which pretty much stated this... but then again, given the methodology, it basically looked like that was their intent all along.Pretty sure this has been determined to be a waste of time. Very little bang for the buck/effort
I saw a study stating this as well.Rather than creating a problem with the bees digestive system, I thought the big problem noted with powdered sugar containing corn starch is that it can damage open brood. Supposedly it can desiccate the larvae and (for very young larvae) the puddle of royal jelly if enough of it enters the cells. Understandably, simply dusting between the frames isn't like dusting straight down into the cells, but still...cells are slanted upwards.