Fig. 4

Summary of the aphid free choice assays performed under normal illumination and in darkness. Aphids (M. persicae) showed a marginally lesser tendency to settle upon plants infected with CMV than on mock-inoculated control plants at 0.25, 1 or 24 h post-placement when the experiment is done under normal illumination (95% credible interval for the probability of settling on an infected plant conditional on settling was 0.36–0.48 for p _0.25 , 0.40–0.49 for p ₁, 0.40–0.49 for p ₂₄) or under continuous darkness. Under continuous darkness aphids showed a tendency to discriminate against settling on plants infected with CMVΔ2b, although 0.5 was contained in all 95% credible intervals. Under normal illumination and in continuous darkness there was no apparent tendency for aphids to discriminate between CMV- or CMVΔ2b-infected plants. The labelling of the y-axis shows the pair of plants being tested (Fny-CMV, Fny-CMVΔ2b, and mock-inoculated plants) and the conditions (normal illumination cycle or continuous darkness) under which the test was carried out. The x-axis showed the range of the 95% credible interval of the parameters p _0.25, p ₁ and p ₂₄, the probabilities of choosing to settle on an infected plant conditional on settling at t = 0.25 h, t = 1 h and t = 24 h, respectively