Modeling the Dynamics of Adaptation to Transgenic Corn by Western Corn Rootworm (Coleoptera: Chrysomelidae)

A simulation model of the population dynamics and genetics of the western corn rootworm, Diabrotica virgifera virgifera LeConte, was created for a landscape of corn, soybean, and other crops. Although the model was created to study a 2-locus problem for beetles having genes for resistance to both cr...

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Bibliographic Details
Published in:Journal of economic entomology 2001-04, Vol.94 (2), p.529-540
Main Authors: Onstad, David W., Guse, Charles A., Spencer, Joseph L., Levine, Eli, Gray, Michael E.
Format: Article
Language:English
Subjects:
Adaptation, Physiological - genetics
Agronomy. Soil science and plant productions
Animals
Biological and medical sciences
Chemical control
Coleoptera - genetics
Computer Simulation
Control
Diabrotica virgifera virgifera LeConte
Female
Fundamental and applied biological sciences. Psychology
Genetics and breeding of economic plants
host plant resistance
Insecticide Resistance
INSECTICIDE RESISTANCE AND RESISTANCE MANAGEMENT
Male
Models, Genetic
Pest animals
Pest resistance
Phytopathology. Animal pests. Plant and forest protection
Plants, Genetically Modified
population genetics
Protozoa. Invertebrates
resistance management
simulation model
Varietal selection. Specialized plant breeding, plant breeding aims
Zea mays
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Summary:A simulation model of the population dynamics and genetics of the western corn rootworm, Diabrotica virgifera virgifera LeConte, was created for a landscape of corn, soybean, and other crops. Although the model was created to study a 2-locus problem for beetles having genes for resistance to both crop rotation and transgenic corn, during this first phase of the project, the model was simulated to evaluate only resistance management plans for transgenic corn. Allele expression in the rootworm and toxin dose in the corn plant were the two most important factors affecting resistance development. A dominant resistance allele allowed quick evolution of resistance to transgenic corn, whereas a recessive allele delayed resistance >99 yr. With high dosages of toxin and additive expression, the time required to reach 3% resistance allele frequency ranged from 13 to >99 yr. With additive expression, lower dosages permitted the resistant allele frequency to reach 3% in 2–9 yr with refuges occupying 5–30% of the land. The results were sensitive to delays in emergence by susceptible adults and configuration of the refuge (row strips versus blocks).
ISSN:0022-0493
1938-291X
0022-0493
DOI:10.1603/0022-0493-94.2.529