文章基本信息

标题：OPTIMAL CONTROL OF PEST RESISTANCE TO TRANSGENIC CROP VARIETIES
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作者：Grimsrud, Kristine M. ; Huffaker, Ray G.
期刊名称：Journal of Food Distribution Research
印刷版ISSN：0047-245X
出版年度：2001
期号：SUPPL
出版社：Food Distribution Research Society
摘要：Transgenic corn varieties entered the market in 1996. These plant varieties carry a gene from thesoil bacterium Bacillus thuringiensis kurstaki, Bt, that makes the plant produce a toxin deadly tothe pest insect European Corn Borer (ECB) Ostrinia nubilalis (Hübner). Since ECB may buildup genetic resistance to this toxin, the growers of transgenic corn varieties are required to plant aportion of their field (refuge) with regular corn. This requirement is expected to prolong theefficiency of Bt corn in combating the ECB because some non-resistant pests can survive in therefuge, and thereby dilute the build-up of resistance in the overall pest population. A fixedrefuge size of 20 percent is the currently recommended "rule-of-thumb" by the EnvironmentalProtection Agency (EPA). Past work has searched for an economically-optimal refuge sizeutilizing discrete-time simulation approaches in which refuge size is treated as an exogenousparameter whose optimal value is found through numerical iteration. The objective of this workis to fine-tune parametric refuge specifications by formulating a bioeconomic model capable ofendogenously determining the optimal trajectory of refuge sizes over time via an analyticaloptimal-control rule. The model will provide novel comparative statics/dynamics resultsdemonstrating the sensitivity of the optimal trajectory to important economic and biologicalparameters.