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A model to evaluate the consequences of GM and non-GM segregation scenarios on GM crop placement in the landscape and cross-pollination risk management


  • Coléno, F.C.
  • Angevin, F.
  • Lécroart, B.


Under European regulations, a product is labelled as GM (genetically modified) if more than 0.9% of one of its ingredients originates from GM material. During collection, crops from many fields are combined to fill a silo. To avoid the risk of mixing GM and non-GM harvests, it is possible to dedicate a silo to a given crop or to define specific times for GM and non-GM product delivery to silos. To evaluate these scenarios for the maize supply chain, we propose a combination of a model of farmers' varietal choice (based on profit evaluation at the field level, taking into account transport costs as well as price and cost differences between GM and non-GM products) and a spatially-explicit gene flow model. Consequences of different segregation strategies for collection zone organization can therefore be compared while using the percentage of GM grain in non-GM crops due to cross-pollination. The 'temporal' strategy leads to a uniform area of GM or non-GM maize, depending on the prices and the weather risks. The 'spatial' strategy leads to areas of either GM or non-GM crops surrounding the corresponding collection silo. GM presence in non-GM batches depends on the size of the non-GM zone and on the prevailing wind. We show how divergent commercial strategies of grain merchants could have consequences on GM presence in non-GM batches.

Suggested Citation

  • Coléno, F.C. & Angevin, F. & Lécroart, B., 2009. "A model to evaluate the consequences of GM and non-GM segregation scenarios on GM crop placement in the landscape and cross-pollination risk management," Agricultural Systems, Elsevier, vol. 101(1-2), pages 49-56, June.
  • Handle: RePEc:eee:agisys:v:101:y:2009:i:1-2:p:49-56

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    References listed on IDEAS

    1. Demont, Matty & Daems, Wim & Dillen, Koen & Mathijs, Erik & Sausse, Christophe & Tollens, Eric, 2008. "Regulating coexistence in Europe: Beware of the domino-effect!," Ecological Economics, Elsevier, vol. 64(4), pages 683-689, February.
    2. Bullock, D. S. & Desquilbet, M., 2002. "The economics of non-GMO segregation and identity preservation," Food Policy, Elsevier, vol. 27(1), pages 81-99, February.
    3. Volker Beckmann & Claudio Soregaroli & Justus Wesseler, 2006. "Coexistence Rules and Regulations in the European Union," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 88(5), pages 1193-1199.
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    Cited by:

    1. Mourad Hannachi & Francois-Christophe Coleno, 2015. "The Virtues of the Vice of Cooperation between Rival Firms: A Simulation Model to Evaluate the Performance of Coopetition Strategy in the Grain Merchant Industry," Journal of Management and Strategy, Journal of Management and Strategy, Sciedu Press, vol. 6(1), pages 62-75, February.
    2. Mourad Hannachi & Francois-Christophe Coleno, 2015. "The virtues of the vice of cooperation between rival firms : a simulation model to evaluate the performance of coopetition strategy in the grain merchant industry," Post-Print hal-01123186, HAL.
    3. repec:eee:ecomod:v:307:y:2015:i:c:p:1-9 is not listed on IDEAS
    4. Gabriel Andreas & Menrad Klaus, 2014. "The Costs of GM and Non-GM Co-existence in Processed Food Systems – Demonstrated for the Cases of the German Supply Chains of Chocolate and Frozen Pizza," Journal of Agricultural & Food Industrial Organization, De Gruyter, vol. 12(1), pages 1-18, January.


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