In the greenhouse experiments, it was found that T. urticae females laid their eggs on VOCos-receiver lima bean leaves at the same level as on VOCwt- receiver leaves. This was probably due to the weaker atmospheric impact of airborne signals in the greenhouse (without air-flow) compared to the open-flow system (with air-flow). These findings are in line with the report from that b-ocimene has no detectable effect on the priming or induction of the secretion of extrafloral nectar in naturally growing lima bean tendrils. Therefore, different environments (open-flow chamber,green- house,field) seem to differently affect whether and how receiver plants respond by undertaking defensive actions.