“…The odors used were benzaldehyde (≥99%, Sigma-Aldrich, Taufkirchen, Germany), 1-butanol (99%, Alfa Aesar, USA), phenylacetaldehyde (95%, Alfa Aesar), + alpha pinene (analytical standard, Fluka, Germany), nonanal (≥95% Sigma-Aldrich), farnesene (mixture of isomers, Sigma-Aldrich), beta caryophyllene (≥80%, Sigma-Aldrich), R+ limonene (analytical standard, Fluka), trans-2-hexen-al (≥95%, Sigma-Aldrich), trans-2-hexen-ol (≥95%, Sigma-Aldrich) and ocimene (≥90%, Sigma-Aldrich). All those odors can be sensed by bees ( [53][54][55][56][57][58][59][60][61] ) (Table 1). All odors were diluted in water except for phenylacetaldehyde that had to be diluted in paraffin oil (puriss, Sigma-Aldrich) for solubility reasons.…”