Wintersterfte internationaal bekeken

Verslag van een studiedag over bijensterfte. Er werd geïnventariseerd welk onderzoek er in Europa wordt gedaan met betrekking tot de massale bijensterft

Biologische bestrijding van varroa met behulp van schimmels

Sinds enkele jaren wordt er volop onderzoek gedaan naar de bestrijding van de varroamijt. Doordat de varroamijt steeds resistenter wordt tegen chemische middelen, wordt er steeds vaker gekeken naar biologische manieren om deze te bestrijden. PPO-Bijen deed een onderzoek naar bestrijding door middel van schimmel

Swarm prevention and spring treatment against Varroa destructor in honey bee colonies (Apis mellifera)

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, Thymova