Landscape Ecology

, Volume 28, Issue 9, pp 1697–1715

Effects of field and landscape variables on crop colonization and biological control of the cabbage root fly Delia radicum

  • Céline Josso
  • Anne Le Ralec
  • Lucie Raymond
  • Julia Saulais
  • Jacques Baudry
  • Denis Poinsot
  • Anne Marie Cortesero
Research Article

DOI: 10.1007/s10980-013-9928-3

Cite this article as:
Josso, C., Le Ralec, A., Raymond, L. et al. Landscape Ecol (2013) 28: 1697. doi:10.1007/s10980-013-9928-3

Abstract

Agriculture intensification has deeply modified agroecosystems from field to landscape scales. To achieve successful pest control using natural enemies, understanding species interactions over all scales remains a challenge. Using the cabbage root fly as a model, we studied whether field and landscape characteristics influenced colonization and infestation of broccoli fields by the pest and its control by natural enemies. We also determined whether species of different trophic level or host specialization would respond to environmental characteristics at the same spatial extent. During a multiple-species and multiple-spatial extent study in northwestern France, we recorded pest colonization and infestation in 68 fields, collected associated natural enemies and assessed crop damages. In each field, we considered management practices and characterized the surrounding landscape in 50–500 m-wide buffers. Our main findings are that Delia radicum and its main natural enemies respond to both field and landscape characteristics. Semi-natural areas supported both crop colonization by pests and natural enemy action. The pest and its enemies differed in their responses to field or landscape variables. Landscape elements such as field banks favored the movement of the pest while impeding the movement of some natural enemies. Pest pressure did not increase with the neighboring density of Brassica crops. The presence of natural enemies did not reduce crop damage but reduced pest emerging rates. Finally, specialist parasitoids responded to the landscape at larger spatial extents than generalists. These results outline the complexity of improving pest control through landscape management.

Keywords

Delia radicumParasitismPredationColonizationInfestationCrop damagesSpatial extentPest managementBiological control

Supplementary material

10980_2013_9928_MOESM1_ESM.doc (105 kb)
Supplementary material 1 (DOC 105 kb)

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Céline Josso
    • 1
    • 2
  • Anne Le Ralec
    • 4
    • 2
  • Lucie Raymond
    • 2
    • 3
    • 5
  • Julia Saulais
    • 4
    • 2
  • Jacques Baudry
    • 6
  • Denis Poinsot
    • 1
    • 2
  • Anne Marie Cortesero
    • 1
    • 2
  1. 1.Institute of Genetics, Environment and Plant Protection (IGEPP – Mixed Research Unit 1349)Rennes 1 UniversityRennesFrance
  2. 2.European University of BrittanyRennesFrance
  3. 3.Dynamics and Ecology of Agroforestrial Landscapes (Dynafor – Mixed Research Unit 1201)ToulouseFrance
  4. 4.Institute of Genetics, Environment and Plant Protection (IGEPP – Mixed Research Unit 1349)AGROCAMPUS OUESTRennesFrance
  5. 5.Institute of Genetics, Environment and Plant Protection (IGEPP – Mixed Research Unit 1349)INRARennesFrance
  6. 6.SAD PaysageINRARennesFrance