Fig. 5. Mean linear speed of T. basalis females in a Y-tube olfactometer in the presence of volatiles from differently treated leaves of V. faba. 'Fed no egg' = leaves damaged by feeding activity (see Fig. 1A); 'fed & egg' = leaves damaged by feeding activity with one egg mass less then 24 h old (see Fig. 1B); 'systemic' = systemically induced leaves (see Fig. 3). N = number of replicates. Bars represent means ± S.E.M. Different letters indicate significant differences at P<0.05 (ANOVA followed by Tukey HSD test).