Landscape Ecology

, Volume 31, Issue 3, pp 567–579

Organic farming affects the biological control of hemipteran pests and yields in spring barley independent of landscape complexity

  • K. Birkhofer
  • F. Arvidsson
  • D. Ehlers
  • V. L. Mader
  • J. Bengtsson
  • H. G. Smith
Research Article

Abstract

Context

Hemipteran pests cause significant yield losses in European cereal fields. It has been suggested that local management interventions to promote natural enemies are most successful in simple landscapes that are dominated by large arable fields.

Objectives

We study how farming category (conventional, new and old organic fields) and landscape complexity affect pests, natural enemies and biological control services in spring barley. We further analyse if yields are related to pest infestation or biological control services.

Methods

The amount of pasture and the length of field borders were used to define landscape complexity around barley fields in Southern Sweden. Arthropods were sampled with an insect suction sampler and predation and parasitism services were estimated by field observations and inspections of pest individuals.

Results

Pest infestation was affected by landscape complexity, with higher aphid, but lower leafhopper numbers in more complex landscapes. Aphid predation was higher under organic farming and affected by effects on predator abundance and community composition independent of landscape complexity. Auchenorrhyncha parasitism was neither significantly affected by landscape complexity nor by farming category. Higher aphid predation rates and lower aphid densities were characteristic for organically managed fields with higher barley yields.

Conclusions

Our results suggest that it is possible to increase both aphid biological control services and barley yield via local management effects on predator communities independent of landscape complexity. However, the success of such management practices is highly dependent on the pest and natural enemy taxa and the nature of the trophic interaction.

Keywords

Aphididae Araneae Auchenorrhyncha Dryinidae Ecosystem service Yield 

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • K. Birkhofer
    • 1
  • F. Arvidsson
    • 1
  • D. Ehlers
    • 2
  • V. L. Mader
    • 3
  • J. Bengtsson
    • 4
  • H. G. Smith
    • 1
    • 5
  1. 1.Department of BiologyLund UniversityLundSweden
  2. 2.Institute of EcologyLeuphana University LüneburgLüneburgGermany
  3. 3.Department of Animal EcologyJustus-Liebig-University GiessenGiessenGermany
  4. 4.Department of EcologySwedish University of Agricultural SciencesUppsalaSweden
  5. 5.Centre for Environmental and Climate ResearchLundSweden

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