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Résumé :
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In order to evaluate the variation in responses of aphids to a range of odour compounds comprising plant volatiles, the alarm pheromone (E)-beta-farnesene and the sex pheromone components (+)-(4 a S,7 S,7 a R)-nepetalactone and (-)-(1 R,4 a S,7 S,7 a R)-nepetalactol, electroantennogram (EAG) responses were measured and compared for (a) the cabbage aphid Brevicoryne brassicae (L.) and the peach-potato aphid Myzus persicae (Sulz.), both fed on Chinese cabbage, (b) two clones of M. persicae, (c) wingless and winged summer forms of M. persicae, and (d) M. persicae fed on Chinese cabbage or an artificial diet. The four comparisons differed significantly for 44 %, 20 %, 16 % and, 12 %, respectively, of the compounds tested. These differences as well as the scatter plots of the comparisons (Figure 1 A-D) support the conclusion that the rank order of factors for differentiating the EAG response profiles in aphids is: species, clone, form and food source.
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