Lethal and sublethal responses of <Emphasis Type="Italic">Sitophilus zeamais</Emphasis> populations to essential oils |
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Authors: | Alice Maria Nascimento de Araújo Lêda Rita D’Antonino Faroni José Vargas de Oliveira Daniela Maria do Amaral Ferraz Navarro Douglas Rafael e Silva Barbosa Mariana Oliveira Breda Solange Maria de França |
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Institution: | 1.Department of Agronomy-Entomology,Federal Rural University of Pernambuco,Recife,Brazil;2.Department of Agricultural Engineer – Centro de Ciências Agrárias,Federal University of Vi?osa,Vi?osa,Brazil;3.Department of Fundamental Chemistry,Federal University of Pernambuco,Recife,Brazil |
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Abstract: | The present study aimed to assess the lethal and sublethal responses of five populations of S. zeamais to the essential oils of Ocimum basilicum and Piper hispidinervum, through toxicity, locomotor behavior (flight and walking activities) and physiological (respiration rate and body mass) evaluations. The populations of S. zeamais were obtained from Machado—MG, Paracatu—MG, Piracicaba—SP, Recife—PE and Tunápolis—SC. To estimate the LC50 of each oil for each population, fumigation tests were performed. The population from Recife exhibited the lowest instantaneous rate of increase (ri) as well the lowest consumption of grain mass. However, Piracicaba was considered the susceptibility pattern, presenting the lowest LC50 for both essential oils, no statistical difference was observed among populations or treatments in the flight activity bioassays. The essential oils effect on walking activity and respiration rates varied among populations. The population from Recife presented the highest walked distance and walk speed, with the lowest resting time and number of stops, as well as the lowest respiration rate and body mass. The present study highlights the importance of the study on population responses, as the five populations of S. zeamais exhibited different patterns of toxic and behavioral effects when subjected to the essential oils of P. hispidinervum and O. basilicum. |
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