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Optimal Control Of Pest Resistance To Transgenic Crop Varieties

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  • Grimsrud, Kristine M.
  • Huffaker, Ray G.

Abstract

Transgenic corn varieties entered the market in 1996. These plant varieties carry a gene from the soil bacterium Bacillus thuringiensis kurstaki, Bt, that makes the plant produce a toxin deadly to the pest insect European Corn Borer (ECB) Ostrinia nubilalis (Hübner). Since ECB may build up genetic resistance to this toxin, the growers of transgenic corn varieties are required to plant a portion of their field (refuge) with regular corn. This requirement is expected to prolong the efficiency of Bt corn in combating the ECB because some non-resistant pests can survive in the refuge, and thereby dilute the build-up of resistance in the overall pest population. A fixed refuge size of 20 percent is the currently recommended "rule-of-thumb" by the Environmental Protection Agency (EPA). Past work has searched for an economically-optimal refuge size utilizing discrete-time simulation approaches in which refuge size is treated as an exogenous parameter whose optimal value is found through numerical iteration. The objective of this work is to fine-tune parametric refuge specifications by formulating a bioeconomic model capable of endogenously determining the optimal trajectory of refuge sizes over time via an analytical optimal-control rule. The model will provide novel comparative statics/dynamics results demonstrating the sensitivity of the optimal trajectory to important economic and biological parameters.

Suggested Citation

  • Grimsrud, Kristine M. & Huffaker, Ray G., 2001. "Optimal Control Of Pest Resistance To Transgenic Crop Varieties," 2001 Annual meeting, August 5-8, Chicago, IL 20452, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
    • Handle: RePEc:ags:aaea01:20452
    DOI: 10.22004/ag.econ.20452
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    1. Terrance Hurley & Silvia Secchi & Bruce Babcock & Richard Hellmich, 2002. "Managing the Risk of European Corn Borer Resistance to Bt Corn," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 22(4), pages 537-558, August.
    2. Terrance M. Hurley & Silvia Secchi & Bruce A. Babcock, 1999. "Managing the Risk of European Corn Borer Resistance to Transgenic Corn: An Assessment of Refuge Recommendations," Center for Agricultural and Rural Development (CARD) Publications 99-sr88, Center for Agricultural and Rural Development (CARD) at Iowa State University.
    3. Terrance M. Hurley & Bruce A. Babcock & Richard L. Hellmich, 1997. "Biotechnology and Pest Resistance: An Economic Assessment of Refuges," Center for Agricultural and Rural Development (CARD) Publications 97-wp183, Center for Agricultural and Rural Development (CARD) at Iowa State University.
    4. Hurley, Terrance M. & Secchi, Silvia & Hellmich, Richard L., 1999. "Managing The Risk Of European Corn Borer Resistance To Transgenic Corn: An Assessment Of Controversial Refuge Recommendations," 1999 Annual meeting, August 8-11, Nashville, TN 21606, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
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