Fig. 2.

Mean residence time of Trichogramma brassicae females on Brussels sprouts leaves treated with accessory reproductive gland (ARG) homogenate of Pieris rapae females. Leaves were treated either with ARG homogenate from virgin females (light grey bars) or ARG homogenate from mated females (dark grey bars) a) 24 h or b) 72 h prior to the bioassay. Untreated leaf squares, adjacent to a site on the same leaf that was treated with ARG homogenate, were simultaneously offered to the wasps in a two-choice contact bioassay in a Petri dish. Number of tested females wasps per bioassay combination, N = 50. Abbreviations: ARG—accessory reproductive gland; ns—not significant; ***P < 0.001 (Wilcoxon matched pairs test)