Figure 4. Importance of minor components in the sex pheromone.

(a–d) Total ion current chromatograms illustrating the manipulation of the iridoid fraction of the L. heterotoma female extract and the frequency of decision for sample or control in the corresponding y-tube experiment when testing the manipulated iridoid fraction against the control. Compounds p1 and p2 were tentatively identified as iridodials; p3 and p4 were behaviourally inactive and thus not identified; p5 is (−)-iridomyrmecin; p6 is (+)-isoiridomyrmecin; p7 was tentatively identified as a third iridomyrmecin; x denotes contaminations. P-values (rounded to third decimal) are given for the two-sided binomial test. Bar colours indicate sample (blue) and control (brown). For each experiment n=30.