Figure 2.

Effects of single and mixed infections on plant volatiles, aphid performance and aphid preference. Results of assays bearing on plant–aphid interactions for mock-inoculated plants (‘controls’, white bars), plants inoculated with the isolates WMV-HQ11 (‘WMV’, light grey bars) or ZYMV-HBCF (‘ZYMV’, black bars) and plants co-inoculated with both viruses (‘mix’, dark grey bars). (a) Average of the cumulated emission of the 16 main organic volatile compounds (±s.e., seven replicates of each treatment); (b) Aphid performance estimated as the average number of aphids in colonies after two weeks (±s.e., ten replicates); (c) Aphid preference in choice arenas for control or virus-infected plants estimated as the average numbers of aphids (±s.e., 10 replicates of each test) on exposed leaves for each of the three types of dual choice tests. Different letters above the bars indicate groups that are significantly different (p-value <0.05). *Paired t-test significant with p-value <0.05.