In contrast to the results using an open-flow system, the oviposition of T. urticae eggs was not different between the VOCos- receiver and VOCwt-receiver leaves in a greenhouse (Figure S2). On the other hand, the VOCos-receiver plants emitted higher levels of TMTT and MeSA in response to T. urticae attack, causing more attraction of predatory mites, in comparison to the VOCwt- receiver plants, in the greenhouse (Figure 5). When VOCos- receiver plants were placed 60 cm apart, the priming of indirect defenses was not detected.