Fig. 4.

Aphid behavioral responses to contact cues of healthy and CMV-infected plants. Fifty aphids were allowed to disperse onto leaves of a healthy (i.e., mock-inoculated) or a CMV-infected release plant and then given the option to emigrate to a neighboring choice plant of the opposite disease status. (A) Fewer aphids were retained on infected release plants than on healthy plants both after 30 min (GLM, data log transformed, df = 1, F = 6.73, P = 0.041) and after 24 h (GLM, df = 1, F = 54.96, P = 0.000). (B) Infected choice plants arrested fewer aphids at 24 h relative to healthy choice plants (GLM, df = 1, F = 32.00, P = 0.001). Four tests were performed for each type of release plant. Asterisks indicate significant differences.