Figure 2

Volatile emission from Rhododendron tomentosum (a) and control and R. tomentosum-exposed Brassica oleracea (b). The mean ± SEM emission of individual volatile compounds detected are shown. Brassica oleracea plants were exposed to R. tomentosum for 24 h at 6 or 22°C, and volatile emissions were collected post-exposure at 22°C. n = 3 in (a) and n = 4 in (b) for both exposure temperatures.