Proceedings of the Netherlands Entomological Society meeting 17 (2006). - ISSN 1874-9542 - p. 133 - 139.
Non-refereed article in scientific journal
In 2004 and 2005 experiments were carried out to test the efficacy and efficiency of Varroa control combined with swarm prevention methods in spring. Honey bee colonies were split in an artificial swarm and a brood carrier. Hereafter the swarms were treated with oxalic acid and the brood carriers either with formic acid (2004) or Thymovar (2005). Both the oxalic acid and the formic acid were very effective, resulting in an average efficacy of 97% and 96%, respectively. There was some worker bee mortality in both treatments. Thymovar was less effective (71%), but did not cause any worker bee mortality. The results show that the combination of Varroa control and swarm prevention can effectively be used in spring. Keywords: Varroa destructor, Apis mellifera, honey bees, spring treatment, swarm prevention, formic acid, oxalic acid, Thymovar
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