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Speakers - Eraldo Lima

Type of the Presentation: (Short lecture)

 

COSTS OF RESISTANCE TO TRANSGENIC CROPS IN THE BEHAVIOUR AND CHEMICAL COMMUNICATION OF Spodoptera frugiperda

 

Eraldo Lima1*, Fernanda F. Sousa1, Nataly de la Pava1, Laura M M Mesa1, Natália Ribas1, Eliseu J. G. Pereira1 and Jeremy N. McNeil2

 

1  Universidade Federal de Viçosa – Dep. de Entomologia; eraldo.lima@ufv.br

2  University of Western Ontario – The Dep. of Biology: jmcneil2@uwo.ca

 

There are many studies demonstrating that the development of resistance to insecticides comes at a cost, reflected in traits such as extended larval developmental time, small adults and reduced fecundity. In contrast, while very few studies have examined the possibility of resistance might affect pheromone communication systems they have all reported some differences in the pheromone biology of resistant and susceptible individuals. In Brazil the fall armyworm has developed resistance to Bt so we tested the hypothesis that the development of resistance impacts female calling behavior, with the prediction that resistant virgin females would call less than susceptible individuals. Contrary to our expectations resistant females spent significantly more time calling that susceptible ones suggesting that there is no cost reflected in calling duration. Interestingly, this would support the results of a parallel study that found no differences in various growth parameters of susceptible and resistant individuals. Experiments are examining both pheromone emission and male responses for unless there are marked changes in the pheromone blend and/or the rate emission then with the extended calling window resistant females would have a higher probability of attracting mates. These finding will be discussed within the context of resistance management when using Bt corn as part of a pest management program.

Acknowledgments – CNPq – Pesquisador Visitante Especial - 407504/2013-3.