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OXALIC ACID TREATMENTS FOR VARROA CONTROL (REVIEW)

OXALIC ACID TREATMENTS FOR VARROA CONTROL (REVIEW),Antonio Nanetti,Ralph Büchler,Jean-Daniel Charriere,Ingemar Friesd,Stine Helland,Anton Imdorf,Seppo

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    • ...Europe and Canada (Gregorc and Planinc 2001, 2002; Charrie` re and Imdorf 2002; Nanetti et al. 2003; Gregorc and Poklukar 2004) by trickling a sugar (sucrose) syrup and OA solution on bees, or by heating OA crystals in hives, creating a vapor (Rademacher and Harz 2006a,b)...
    • ...Although the mode of action against varroa mites is not clearly understood, it seems that direct contact with the low pH of OA has a deleterious effect on the mite (Nanetti et al. 2003)...

    D. Sammataroet al. Comparing Oxalic Acid and Sucrocide Treatments for Varroa destructor (...

    • ...A considerable amount of research on tracheal mite (Acarapis woodi (Rennie)) and varroa mite control with organic acids (formic, lactic, and oxalic acid) and essential oils (thymol, eucalyptol, etc.) has been conducted in Europe, the US, and elsewhere (Imdorf et al. 1996; Fries 1997; Thomas 1997; Nanetti et al. 2003)...
    • ...Several oxalic acid formulations have been tested in Europe, with some reaching >90% varroa control (Thomas 1997; Brødsgaard et al. 1999; Buchler 2000; Nanetti et al. 2003)...
    • ...One promising application technique is the “trickle method”, whereby variable concentrations of oxalic acid (1.8-4.5%) are dissolved in sucrose solutions (0-60%) and trickled onto adult bees, the volume of solution depending on bee colony size and strength (30-50 ml/colony) (Nanetti et al. 2003)...
    • ...Oxalic acid also provided good control of varroa; however, it is typically reserved as a lateseason treatment or for other times in which there is little or no brood production, as there are conflicting reports to its effects on bees, ranging from no deleterious effect to impaired queen performance and overwintering success (Hiiges et al. 1999; Nanetti et al. 2003)...

    Michael S. Stanghelliniet al. Evaluation of Selected Biopesticides for the Late Fall Control of Varr...

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