Reference : Predominant effects of host plant species on Aphis gossypii aphid and Episyrphus balteat...
Scientific congresses and symposiums : Poster
Life sciences : Entomology & pest control
Predominant effects of host plant species on Aphis gossypii aphid and Episyrphus balteatus hoverfly in a tritrophic approach
Poligui, René Noël mailto [Université de Liège - ULg > > > Form. doct. sc. agro. & ingé. biol.]
Francis, Frédéric mailto [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
Haubruge, Eric mailto [Université de Liège - ULg > Services administratifs généraux > Vice-Recteur de Gembloux Agro Bio Tech >]
63th International Symposium on Crop Protection
May 24, 2011
Ghent University , Faculty of Bioscience Engineering
[en] Aphis ; Hoverfly ; biologic parameters ; host plants ; prey-host influence ; oviposition ; biological control
[en] The aphid Aphis gossypii Glover (Homoptera: Aphididae) is known as worldwide important pest. It causes serious injuries to crops, but is also able to feed on various cultivated and wild plants. Some programs are developped to control this aphid. In many studies , hoverfy Episyrphus balteatus De Geer (Diptera : Syrphidae) is used as an efficient and aphid specific predator in biological control systems. In this work, we study cotton aphid choice plant discrimination, the effect of host plants on its developpment(fecondity and mortality), and the E.balteatus foraging and oviposition behavior according aphid host plants. Biologic parameters were observed using various plant combinations. E.balteatus behavioral observations were conducted using the Noldus Observer v.5.0. A.gossypii makes discriminant choice of his hosts, with better preference on Cucurbita pepo L. (Cucurbitaceae) and Capsicum annuum L. (Solanaceae). Dacryodes edulis (G. Don) H.J. Lam. (Burseraceae) and Vicia faba L. (Fabaceae) are the midle choice while Hibiscus sabdariffa L. (Malvaceae) is less chosen. A.gossypii develops easily on C.pepo, and weakly on C.anuum, H.sabdariffa,and V.faba. D. edulis induces very high mortality to A.gossypii. According to E. balteatus behavior, A. gossypii is more attractive when infesting C .pepo and V.faba, less on H. sabdariffa. While non infested , the hoverfly more attractive plant is V.faba. Our results highlited the importance of interactions between aphids and their host plants and the prey-host influence on a specific aphid predatory hoverfy. Suitable ways in correlation with this work are to investigated to complete this study and perform aphids biological control.
Thèse : Etude de l'entomofaune des associations culturales prenant en compte le safoutier(Dacryodes edulis) dans le Haut-Ogooué, Gabon.
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