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Fig. 4. Response of T. basalis females in a Y-tube olfactometer to
volatiles from V. faba leaves damaged by feeding activity and with
(A) a 72-96-h-old egg mass and (B) a hatched egg mass (120 h old) (test)
versus undamaged leaves offered in the control arm. 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.