Fig. 1. Response of T. basalis females in a Y-tube olfactometer to volatiles from differently treated plants (test) of V. faba (A,B) or P. vulgaris (C) versus undamaged plants (control): (A) volatiles from feeding damaged leaves; (B,C) volatiles from feeding damaged leaves with egg masses (24 h old). N = number of replicates. Bars represent means ± S.D. for the time spent by the wasp females in both the arms over an observation period of 600 s. Different letters indicate significant differences determined by t-tests for paired samples.