E-<i>β</i>-ocimene emission by the brood during 20 minutes.

<p>A. as ng per individual. B. as ng per mg of individual. (Different letters indicate significant differences in individual E-<i>β</i>-ocimene emission (P<0.05) (n≥4), cross: mean, box: 25%–75%; line in the box: median, whisker: Min-Max, //: larvae cell capping).</p

Comparison of the different effects of BEP (red), E-<i>β</i>-ocimene (blue) and real brood (black) on worker physiology and behaviour.

<p>(dotted line: low pheromone production).</p