Oxalic acid is a highly effective substance for controlling the varroa mite in hives without brood. With correct utilisation and dosage, the three application techniques utilised to date - viz., spraying, trickling and sublimation - offer an acaricidal effect of over 95% whilst being well tolerated by the bees. Our tests have shown that an oxalic acid treatment the previous autumn does not leave residues in spring honey.
There are various types of evaporators of varying effectiveness. We advise making a choice based on the results of our tests6. Moreover, we have tested a new aerosol-based distribution principle in Swiss hives, with good results.
Oxalsäure sprühen – eine hochwirksame Behandlung im Spätherbst gegen Varroa destructor (German (PDF, 28 kB, 20.01.2017), French (PDF, 33 kB, 20.01.2017) and Italian (PDF, 29 kB, 20.01.2017)) Oxalic acid spraying - a very efficient treatment against Varroa destructor in late autumn
J.D. Charrière, A. Imdorf, P. Fluri (2001)
Oxalic acid treatment by trickling against Varroadestructor: recommendationsfor use in central Europe andunder temperate climateconditions (PDF, 486 kB, 20.01.2017)
J.D. Charrière, A. Imdorf (2001)
Optimale Anwendung der Oxalsäure beim Verdampfen (German (PDF, 101 kB, 20.01.2017) , French (PDF, 107 kB, 20.01.2017) and Italian (PDF, 108 kB, 20.01.2017)) Optimized method for the evaporation of oxalic acid
A. Imdorf, J.D. Charrière, R. Kuhn (2005)
Bee tolerance of different winter Varroa treatments (PDF, 152 kB, 20.01.2017)
J.D. Charrière, A. Imdorf, R. Kuhn (2004)
Determining the maximum residue level (MRL) for oxalic acid in honey (PDF, 31 kB, 20.01.2017)
A. Imdorf, E. Rademacher (2004)
Nicht alle Oxalsäure-Verdampfungsgeräte haben eine hohe Wirksamkeit! (German (PDF, 138 kB, 20.01.2017), French (PDF, 141 kB, 20.01.2017) and Italian (PDF, 139 kB, 20.01.2017)) Not all Oxalic Acid Evaporation Devices are very effective!
A. Imdorf, R. Kuhn, A. Feuz (2004)
