EAG responses of Lobesia botrana males and females collected from Vitis vinífera and Daphne gnidium to host-plant volatiles and sex pheromone compounds [Research data]
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We analyzed electroantennogram (EAG) responses of male and female adults of Lobesia botrana (Denis et Schiffermuller) (Lepidoptera: Tortricidae) collected as larvae from the host plants Vitis vinifera L. and Daphne gnidium L. The host-plant odorants tested were either V. vinifera-specific [1-octen-3-ol,
(E)-β-farnesene, (E)-4,8-dimethyl-1,3,7-nonatriene], D. gnidium-specific (2-ethyl-hexan-1-ol, benzothiazole, linalool-oxide, ethyl benzanoate), or were shared by both host-plants (linalool, methyl salicylate). Sex pheromone compounds were also tested. Male response to the major pheromone component (E7,Z9-12:Ac) was higher than to any other stimuli, whereas response to the minor pheromone compounds (E7,Z9-12:OH, Z9-12:Ac) was not different from the response to the plant odorants. Female response to pheromone was lower or not different from that of plant odorants. Response to pheromone was higher in males than in females whereas response to plant volatiles was not different between sexes, except for methyl salicylate which elicited higher response in females. (E)-β-farnesene elicited higher EAG responses than several other plant odorants in both sexes. No-significant interaction between host-plant odorant and sex indicated lack of sex specialization for host-plant volatile detection. Larval host-plant affected overall EAG responses (higher amplitude in V. vinifera), however lack of significant interaction between plant volatile and larval host-plant suggested lack of specialization for plant-volatile detection between V. vinifera and D. gnidium individuals.
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