Yes, Randy Oliver stated that you MAY be able to control varroa with sugar dusting by dusting "EVERY TWO WEEKS" If you have a few colonies and you have nothing better to do with your life than you go right ahead and buy a barrel of powder sugar and dust your life away.
I dont have time for might, maybe, if, well, ah, hmm, could, should of, could of, treatments. I need to know I am going to knock off enough mites so I dont lose half my colonies every winter. I dont know how many colonies you have, how long you have had the, etc. What I do know is a colony will not make it past its third winter (usually not past its second) without viable mite control treatments. Maybe VSH may have a shot at it. Just regular hygienic bees wont. Those who want to blame colony deaths on anything but mites because their bees dont have mite problems will not have mite problems.
I am trying to find as many organic options that have viable efficacy rates so I can get away from insecticides. Of course bees that help keep varroa populations down are great and I buy them. Pure VSH bees are not viable, they are too hygienic, abort too much brood, and dont produce profitable honey crops. They are a step in the right direction, but not the cure.