Abstract
Non-random oviposition preference by target pest species on Bt and non-Bt refuge plants may increase the proportion of the population under selection pressure, reducing the value of the refuge strategy for resistance management. Here, we tested the oviposition preference for Bt over non-Bt plants and the damage-avoiding oviposition behavior of moths of the fall armyworm (FAW), Spodoptera frugiperda, a worldwide pest species with three reported cases of field-evolved resistance to Bt maize. In the greenhouse, choice assays indicated no oviposition preference for Cry1F Bt maize over its non-Bt isoline whatever intact or injured by FAW larvae. In a field experiment in a region of intensive agriculture in Brazil, the number of egg masses and FAW larvae was recorded on seven Bt maize varieties and two non-Bt maize varieties during vegetative and reproductive growth stages. There was only a weak oviposition preference by FAW moths for less damaged plants in the V10 stage. When using Cry1A.105 + Cry2Ab Bt maize and 50% refuge in a field experiment in another region in Southeastern Brazil, the number of egg masses on Bt and non-Bt plants also indicated no oviposition preference by the moths. Consistently, these results indicate that FAW moths do not distinguish Bt and non-Bt plants for oviposition and that conspecific larval damage has minor interference in the oviposition choice. Therefore, there seems to be random egg-laying preference of FAW moths in Bt maize fields, an oviposition behavior typical of generalist moth species and unlikely to be associated with the rapid selection of Bt-toxin-resistant FAWs.
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Acknowledgements
We thank Professor Márcio Henrique Pereira Barbosa and the Department of Plant Science for the greenhouse and field space allocated for the experiments. We also thank the Horita Group that allowed conducting field experiments in Western Bahia State, together with Embrapa Cerrados (Brazilian Agricultural Research Corporation) and the graduate and undergraduate research assistants in our laboratory for assisting with the insect rearing, plant cultivation, and data collection. Finally, we thank the National Council of Scientific and Technological Development (CNPq) and the CAPES foundation (Finance code 001; Brazilian Ministry of Education) for the financial support provided.
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Gonçalves, J., Rodrigues, J.V.C., Santos-Amaya, O.F. et al. The oviposition behavior of fall armyworm moths is unlikely to compromise the refuge strategy in genetically modified Bt crops. J Pest Sci 93, 965–977 (2020). https://doi.org/10.1007/s10340-020-01219-5
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DOI: https://doi.org/10.1007/s10340-020-01219-5