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Contest and Scramble Competition and the Carry-Over Effect in Globodera spp. in Potato-Based Crop Rotations Using an

W Van Den Berg1, W A H Rossing, J Grasman

  • 1Applied Plant Research, Wageningen UR, P. O. Box 430, 8200 AK Lelystad, the Netherlands Biological Farming Systems Group, Wageningen UR, Marijkeweg 22, 6708 Wageningen, the Netherlands Biometris, Wageningen UR, Postbus 100, 6700 AC Wageningen, the Netherlands.

Journal of Nematology
|March 5, 2009
PubMed
Summary

A new Ricker model accurately predicts potato cyst nematode population dynamics and yield loss. This model aids in optimizing crop rotation strategies for sustainable agriculture and managing nematode infestations.

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Area of Science:

  • Agricultural Science
  • Ecology
  • Population Dynamics

Background:

  • Potato cyst nematodes (Globodera pallida) cause significant yield loss in potato crops.
  • Understanding nematode population dynamics is crucial for effective pest management strategies.
  • Existing models often struggle with parameter estimation and biological realism.

Purpose of the Study:

  • To develop and validate a parsimonious model for potato cyst nematode population dynamics.
  • To integrate population dynamics with yield-loss assessment for economic analysis.
  • To inform sustainable agricultural practices and crop rotation planning.

Main Methods:

  • Utilized an extended Ricker model with a linear term to simulate nematode population dynamics, incorporating competition and egg carryover.
  • Employed empirical Bayesian methods to fit the model to a 3-year field experiment dataset.
  • Combined the population dynamics model with a yield-loss model to derive economic thresholds.

Main Results:

  • The three-parameter model effectively captured potato cyst nematode population dynamics across various densities and potato cultivars.
  • Empirical Bayesian methods facilitated robust parameter estimation, overcoming limitations of previous models.
  • An equation was derived to calculate the minimum gross margin for a fourth crop in a 3-year rotation, balancing economic returns and nematode impact.

Conclusions:

  • The developed Ricker model offers an appropriate level of complexity for analyzing nematode population dynamics and yield loss.
  • This modeling approach provides a valuable tool for optimizing crop rotation and managing nematode infestations in potato production.
  • The findings have implications for future research priorities and the development of nematode prediction schemes.