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Master Thesis

Préférence des femelles chez une communauté de mouches des fruits (Diptera : Tephritidae) vis-à-vis de la gamme de fruits-hôtes présente à La Réunion

Abstract : In Reunion Island, 8 species of Tephritidae are pests of fruit and vegetable crops. Six of them are exotic invasive species. Some species are oligophagous, such as Bactrocera cucurbitae and Neoceratitis cyanescens. By contrast, some species are polyphagous, such as Bactrocera zonata, and attack a wide range of host plants from different families. Tephritidae host plant specialisation is determined by female preferences and larval performances in the fruit, but in the field it also influenced by climate and interspecific competition. To better understand the origin of the host range observed in the field, female preferences experiments have been carried in the laboratory for Bactrocera cucurbitae, Bactrocera zonata, Ceratitis catoirii and Neoceratitis cyanescens by testing 20 fruits from 13 different families. We studied the long distance attraction to host plant with an olfactometer test. Then, we studied the final acceptation of the host plant with fecundity tests. These data have been compared for each species with data for larval performances already available. Neoceratitis cyanescens is attracted by a wide range of host plants, its specialisation observed in the field would be rather linked to the larval stage able to develop only on a limited number of host fruits. In addition to Cucurbitaceae, B. cucurbitae is also attracted by several fruits like mango and tomato in which its larvae have also a good development. Attacked in Africa and no in Reunion Island, these fruits may be considered as potential hosts. The restriction of its host range would be more due to interspecific competition with Ceratitis capitata and Ceratitis rosa. While C. catoirii has almost disappeared from Reunion because of interspecific competition, it shows a generalist profile in laboratory. Overall, host plant range observed in the field seems more influenced by the larval performance and interspecific competition than female preferences.
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Master Thesis
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Submitted on : Tuesday, November 25, 2014 - 8:51:54 AM
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Sarah Baldy. Préférence des femelles chez une communauté de mouches des fruits (Diptera : Tephritidae) vis-à-vis de la gamme de fruits-hôtes présente à La Réunion. Sciences agricoles. 2014. ⟨dumas-01086831⟩



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