LASI research shows that of the three application methods used by beekeepers (trickling, spraying, sublimation) to control Varroa with oxalic acid, sublimation is the best in all respects. Sublimation is effective at lower doses, causes no harm to the bees, and results in colonies with more brood in Spring. Spraying significantly reduced colony survival. Application of 2.25g oxalic acid via sublimation to broodless hives in Winter killed 97%bfthe Varroa.
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