VOCos-receiver or VOCwt-receiver lima bean plants were placed 30 cm apart from four emitter tobacco plants (NtOS2 or WT plants) in a greenhouse for 7 days. The VOCos-receiver or VOCwt- receiver plant was subsequently treated with T. urticae, and uninfested plants were placed 30 cm apart from the VOCos-receiver or VOCwt- receiver plants for 1 or 7 days. The second receiver was subsequently exposed to T. urticae for 1 day.