18.104.22.168. Pheromone traps to estimate drone density
Pheromone traps, prepared from synthesized queen pheromone (9-oxo-2-decenoic acid, abb., 9-ODA) or extracted in acetone ((CH3)2CO) from honey bee queens can be used to lure airborne drones. Additionally, live or model queens, in which the thorax is fixed or tethered, can serve to attract drones. The details of the technique and necessary equipment are given in the BEEBOOK paper on behavioural studies (Scheiner et al., 2013).