-----Original Message----- >From: Bill Truesdell > >Some trials were run in Maine using powdered sugar... >There were mites in every hive but the rolls did not pick them up. I am sure this is one of the reasons that the researchers at the TN state bee meeting recommended a natural mite fall count only - they said that ether roll and sugar roll both could give false negatives, even with significant infestation. Natural mite drop, however, seemed to correspond directly to the actual infestation of the hive. Actual numbers they recommended to use for treatment are, I am sure, in the archives from around last fall. K. Oland