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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 429361
Title Queen survival and oxalic acid residues in sugar stores after summer application against Varroa destructor in honey bees (Apis mellifera)
Author(s) Cornelissen, B.; Donders, J.N.L.C.; Stratum, P. van; Blacquière, T.; Dooremalen, C. van
Source Journal of Apicultural Research 51 (2012)3. - ISSN 0021-8839 - p. 271 - 276.
Department(s) PRI BIOINT Entomology & Virology
PPO Bees
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) colonies - jacobsoni
Abstract Methods using oxalic acid (OA) to control Varroa destructor in honey bee (Apis mellifera) colonies are widely applied. In this study, the effects of an OA spray application in early summer on the survival of young and old queens, and on OA residues in sugar stores were investigated. A questionnaire among beekeepers was used to determine the ‘normal’ and ‘acceptable’ queen mortality as a result of beekeeper activities. ‘Acceptable’ queen mortality (4.1 ± 0.1% (n = 11)) did not differ from queen mortality after OA spray application (2.7% for old and 3.8% for young queens). ‘Normal’ queen mortality (1.1 ± 0.4% (n = 11) and 4.2 ± 0.1% (n = 11) for old and young queens, respectively) also did not differ from queen mortality after spraying OA. OA found in sugar stores of colonies sprayed with OA (94 ± 7 mg/kg (n = 8)) did not differ from control colonies (80 ± 4 mg/kg (n = 9)). Finding OA residues in both groups was probably due to bees foraging on chestnut (Castanea sativa) trees. We conclude that OA spray application in periods without brood during spring and summer poses little danger to honey bee queens and that in sugar stores harvested in summer, OA residues are within the limits of natural variability Supervivencia de las reinas y residuos de ácido oxálico en el azúcar almacenado en abejas (Apis mellifera) tras el tratamiento estival contra Varroa destructor. Resumen: Los métodos de control contra Varroa destructor en colonias de la abeja de la miel (Apis mellifera) usando ácido oxálico (AO) son ampliamente aplicados. En este estudio se ha investigado el efecto de la aplicación de un espray de AO a principios del verano sobre la supervivencia de las reinas tanto jóvenes como adultas, y los residuos del AO en el azúcar almacenado. Se pasó un cuestionario entre los apicultores para determinar cuál era la mortalidad “normal” y “aceptable” de la reina como consecuencia de las actividades apícolas. La mortalidad “aceptable” (4.1 ± 0.1% (n = 11)) no difirió de la mortalidad tras la aplicación del espray de AO (2.7% para reinas adultas y 3.8% para jóvenes). La mortalidad “normal” (1.1 ± 0.4 % (n = 11) y 4.2 ± 0.1% (n = 11) para reinas adultas y jóvenes, respectivamente) tampoco difirió de la mortalidad tras la aplicación del espray AO. El AO encontrado en las reservas de azúcar de las colonias tratadas con el espray (94 ± 7 mg/kg (n = 8)) no fue diferente de las colonias control (80 ± 4 mg/kg (n = 9)). El haber encontrado residuos de AO en ambos grupos fue probablemente debido al forrajeo de las abejas en los castaños (Castanea sativa), además de a la utilización de azúcares artificiales en la alimentación. Concluimos que la aplicación del espray de AO en periodos sin cría durante la primavera y el verano plantea pocos riesgos tanto para las reinas como para el azúcar almacenado. Los residuos de AO están dentro del límite de variabilidad natural
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