Fig. 4. Age-effect on oviposition site preference on menthol in choice lines.

Bars represent the mean (± SEM) for the oviposition site preference (MPI; A) and egg number per female (EPF; B) in control, P-choice and M-choice lines (empty, shaded and filled bars, respectively) in the same F12 females of different ages (1–5 days old). Note that 4- and 5-day-old female data were pooled. Letters indicate the significant differences (p = 0.05) with a Kruskal–Wallis test (n = 8–10).