were not enriched in this experiments. Therefore, the whole
experiment was considered to have been conducted at ambient
ozone levels and all receiver plants were used during phase 2.
Phase 2: Oviposition preference of P. brassicae—cr-VOC and ir-VOC
cabbage plants from phase 1 were paired in polycarbonate cages
(60 cm L
33 cm W
33 cm H) in a controlled environment room
(light: dark cycle 16L: 8D and 20 C). Plants were paired in each
cage, cr-VOC vs ir-VOC. Ten P. brassicae females were released
inside each cage for 24 h. The number of eggs, the number of
clutches and the number of eggs per clutch laid during that time
were recorded. The experiment was conducted using 33 plant
pairs.