Aphid behavioral responses to volatile cues from healthy and CMV-infected plants. In pair-wise choice tests performed separately for wingless and winged morphs of both species, aphids preferred the space below leaves infected with CMV over space below untouched or mock-inoculated leaves. Data were analyzed by GLM and are presented as the mean ± SE and are arranged horizontally by the pairs involved in each choice test. *, P < 0.05 for pair-wise comparisons. (A) For wingless A. gossypii, untouched vs. infected: F = 26.5, P = 0.001; mock vs. infected: F = 9.22, P = 0.009. For winged A. gossypii, untouched vs. infected: F = 6.33, P = 0.025; mock vs. infected: F = 7.36, P = 0.019. (B) For winged M. persicae, untouched vs. infected: F = 5.31, P = 0.043; mock vs. infected: F = 11.467, P = 0.0069. For wingless M. persicae, untouched vs. infected: F = 5.91, P = 0.027; mock vs. infected: F = 3.46, P = 0.08. Untouched and mock-inoculated plants did not differ in attractiveness in any treatment.