Estimating the landscape distribution of eggs by Helicoverpa spp., with implications for Bt resistance management

H.R. Parry, C.A. Paull, M.P. Zalucki, A.R. Ives, A. Hulthen and N.A. Schellhorn

Ecological Modelling, 2017, vol. 365, issue C, 129-140

Abstract: Transgenic crops expressing insecticidal toxins of Bacillus thuringiensis (Bt) have been deployed in agricultural landscapes around the globe. While the key strategy to delay resistance is the mandatory planting of a non-Bt refuge crop that is preferred by the target pest, the efficacy of this resistance management strategy across different landscape contexts over time is rarely considered. Here, we develop an individual-based model to simulate the spatio-temporal distribution of a highly mobile, polyphagous, global pest, Helicoverpa spp, across agricultural landscapes dominated by transgenic cotton. The simulation model allows us to explore refuge ‘electivity’, the relative utilization of refuge habitat by female Helicoverpa, in relation to Bt cotton habitat. Refuge electivity is an emergent function of egg distributions resulting from individual moth behavior, within multiple landscapes during different seasons and crop phenology.

Keywords: Area-wide management; Spatio-temporal dynamics; Repast Simphony; Agent-based models; Movement ecology; Lepidoptera (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:ecomod:v:365:y:2017:i:c:p:129-140

DOI: 10.1016/j.ecolmodel.2017.10.004

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