I don't know, but we're not here to promote off label use of pesticides.
I know what you mean, Barry, and I'm not trying to start an argument, but Mineral Oil and Powdered Sugar aren't labeled for the Treatment of Varroa and they are freely talked about all the time. Is that different? Just curious.
About powdered sugar, while we are slightly on the topic, it doesn't knock off a very good percentage of mites, I think I read 40-60% of the mites that aren't in brood. The use of it is extremely labor intensive to hit all of the mites that are hatching out, and it puts a LOT of stress on the bees. A recent survey on winter loss in New Jersey showed that people who didn't treat for mites lost 65% of their colonies over winter, while those who sugar dusted to control mites lost 75%. The legal treatments only lost 15-20% and most of those losses were ones that were treated to late in the year to have young winter bees that weren't parasatised or fed by parasatised bees. Hitting them early (August in NJ) with any type of treatment that works in warm weather will knock off the large majority of mites.