(A) Total volatile release from healthy and CMV-infected plants in the greenhouse and field. Total volatiles are shown as mean ± SE. For whole-plant collections, treatment n = 8, df = 2, F = 8.13, P = 0.003. Infected plants released significantly more volatiles than controls (infected vs. mock, P = 0.004; infected vs. untouched, P = 0.012; mock vs. untouched, P = 0.89). For individual leaves of plants growing in the field, treatment n = 19. Infected plants released significantly more volatiles than healthy plants (*, P < 0.05, df = 1, F = 5.87, P = 0.012). (B) Individual volatile compounds released by CMV-infected C. pepo. Mean ± SE error for the 20 most abundant compounds consistently released during a 12-h daylight period. The same compounds are present in each treatment, and the relative proportions of compounds released by healthy and infected plants are similar. A, (E)-2-hexenal; B, 6-methyl-5-hepten-2-one; C, (E)-β-ocimene; D, methyl benzoate; E, linalool; F, 4-ethyl-benzaldehyde; G, ethyl-benzaldehyde; H, (Z)-3-hexen-1-yl butyrate; I, (Z)-3-hexen-1-yl 3-methylbutyrate; J, (E)-2-decenal; K, ethyl acetophenone; L, ethyl acetophenone; M, (Z)-3-hexenyl butyrate; N, 3,5-dimethyl-1,2,4-trithiolane; O, tetradecane; P, citronellyl propionate; Q, beta-selinene; R, (Z)-jasmone; S, α-humulene; T, unknown.