Séminaire de Blas LAVENDERO (Universidad de Tacla, Chili)



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Le vendredi 18 septembre 2015 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Le vendredi 18 septembre 2015 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Understanding the context dependency of biological control in real agroecosystems
Abstract :
The effect of diversity on biocontrol is conditioned by the life traits of the pest and of the natural enemies, by their distribution, and by the spatial and temporal scale at which studies are conducted. For the control of aphids, the effect of the natural enemies diversity is particularly complicated to assess, as the patchy distribution of the pest and the high temporal fluctuations in its populations, promote a positive effect of natural enemy diversity, whereas the aphids’ simple life history is likely to decrease this effect. By understanding this context dependency of biological control services the success or failure of biological control agents can be better addressed. The following presentation is a summary of a series of studies carried out on in Chile to increase the understanding of the control of three main aphid pests; Eriosoma lanigerum in apple orchards, Sitobion avenae in wheat and Acyrthosiphon pisum in lucern. Using a combination of molecular and classical methods, we try to address the effect of host specialization and recently of landscape complexity, on the success/failure in the control of these aphids.

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