Fig. 6. Oviposition preference of P. xylostella under laboratory conditions. Adults
were offered plants from four different treatments as options for oviposition.
Undamaged cabbages were exposed to either undamaged (cr-VOC) or herbivoreinfested
broccoli plants (ir-VOC) under ambient ozone (amb) and elevated ozone
levels (ozo). Results of the LSD post hoc test used for pairwise comparisons among
treatments (P values) are displayed above bars. n = 17. Bars represent mean ( SE)
percentage of eggs.