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Etude de la Bio-écologie des Névroptères dans une perspective de lutte biologique par conservation.

Abstract : In the perspective of conservation biological control, the bio-ecological conditions of maintenance of auxiliaries have been studied in the agroecosystems of western France.

Surveys of the entomofauna and the flora have been carried out on five types of farming with cabbage -vegetable and -seed-grower crops. The Neuroptera (Chrysopidae and Hemerobiidae) predators of cabbage aphids, Myzus persicae and Brevicoryne brassicae, have been used as study model. Their abundance and assemblage are in relation to the landscape structure at the farm scale.
The study of flight activity patterns of populations of Chrysoperla carnea complex species showed by the surveys and the analysis of gut contains of adults (identification of pollen grains, honeydew), that C. affinis and C. lucasina have nycthemeral and seasonal flight patterns between different types of habitats (overwintering, resting-place, food, and reproduction sites) to achieve their life cycle between or in the agroecosystems. The results allowed also to verify the existence of three types of flight: migration to and from the overwintering sites, preovipository migration of females and dispersal.

Our results allow to suggest management of surrounding landscape of crops in providing habitats to attract and to maintain the Neuroptera in the agroecosystems with cabbage crops.
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https://tel.archives-ouvertes.fr/tel-00198786
Contributor : Johanna Villenave-Chasset <>
Submitted on : Monday, December 17, 2007 - 8:16:05 PM
Last modification on : Tuesday, October 30, 2018 - 3:04:00 PM
Long-term archiving on: : Thursday, September 27, 2012 - 11:45:22 AM

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  • HAL Id : tel-00198786, version 1

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Johanna Villenave-Chasset. Etude de la Bio-écologie des Névroptères dans une perspective de lutte biologique par conservation.. Interactions entre organismes. Université d'Angers, 2006. Français. ⟨tel-00198786⟩

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