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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.