All the methods have some effect on Varroa mites. The reason has to do with spearmint and wintergreen which cause mite drop but you need screened bottoms for them to work. But many things cause mite drop. You are just buying some time if you are in the north or anywhere with confining winters. You may end up with queen problems with the treatments. Crisco is a Tracheal mite control and the only thing on the list that actually works and has good science behind it. All the others have been around for a long time and those who use them say they work until their colonies die and they drop out of beekeeping. Bill Truesdell Bath, Maine ****************************************************** * Full guidelines for BEE-L posting are at: * * http://www.honeybeeworld.com/bee-l/guidelines.htm * ******************************************************