Are Mavrik, Spur and other forms of fluvalinate, or formic acid, commonly used to treat varroa-infested hives in the U.S.? I realize these treatments are not currently approved for use with bees in the U.S., but does the cost difference between Apistan and these unapproved treatments provide a strong temptation for commercial beekeepers? How widespread is the use of unapproved treatments? Would appreciate learning from any speculation and/or knowledge on this. Public or private E-mail. Thanks, John Caldeira [log in to unmask] John Caldeira Dallas, Texas