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Increasing crop field size does not consistently exacerbate insect pest problems.

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Area of Science:

  • Agricultural Ecology
  • Ecosystem Services
  • Pest Management

Background:

  • Increasing farm biodiversity can enhance ecosystem services, including natural pest control.
  • Agroecological literature often assumes larger monocultural fields exacerbate pest impacts.
  • Theoretical models present uncertain predictions regarding field size and pest densities.

Purpose of the Study:

  • To empirically investigate the relationship between crop field size and arthropod pest densities.
  • To quantify the impact of field size on pesticide applications and crop yield.
  • To evaluate the validity of the assumption that larger fields disrupt natural pest control.

Main Methods:

  • Conducted a broad survey across 14 pest species, 5 crops, and 20,000 field-years of data.
  • Quantified pest densities, pesticide applications, and crop yield in relation to field size.
  • Correlated pest responses to field size with responses to landscape crop simplification.

Main Results:

  • No consistent evidence that larger fields lead to worse pest impacts across all species.
  • Pest severity was independent of field size for 9 out of 14 species.
  • Larger fields reduced pest problems for 4 species; only 1 species showed increased pest severity with larger fields.

Conclusions:

  • The assumption that larger field sizes consistently disrupt natural pest control is not supported by empirical data.
  • Pest responses to field size and landscape simplification appear driven by shared ecological processes.
  • Findings challenge conventional agroecological wisdom regarding field size and pest management.