Deltamethrin‐induced feeding plasticity in pyrethroid‐susceptible and ‐resistant strains of the maize weevil, Sitophilus zeamais

dc.creatorGuedes, N. M. P.
dc.creatorGuedes, R. N. C.
dc.creatorSilva, L. B.
dc.creatorCordeiro, E. M. G.
dc.date2018-12-20T10:36:53Z
dc.date2018-12-20T10:36:53Z
dc.date2009-08
dc.date.accessioned2023-09-27T20:57:01Z
dc.date.available2023-09-27T20:57:01Z
dc.identifier1439-0418
dc.identifierhttps://doi.org/10.1111/j.1439-0418.2009.01391.x
dc.identifierhttp://www.locus.ufv.br/handle/123456789/22868
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8951491
dc.descriptionPhenotypic plasticity contributes to the adaptative evolution of populations exposed to new or altered environments. Feeding plasticity is a component of phenotypic plasticity not usually considered in insect strains adapted to insecticide‐altered environments, but which may either accentuate or mitigate insecticide resistance. This is a concern in the pyrethroid‐resistant strains of the maize weevil Sitophilus zeamais Motsch. (Col., Curculionidae), and the reason for this study. A pyrethroid‐susceptible and two pyrethroid‐resistant strains of maize weevil were subjected to free‐choice and no‐choice tests with maize grains sprayed with increasing doses of the pyrethroid, deltamethrin. The insects from the pyrethroid‐resistant strains exhibited higher feeding avoidance with increased deltamethrin doses than insects from the susceptible strain when subjected to free‐choice tests. The strains of maize weevil physiologically resistant to pyrethroids were also behaviourally resistant to deltamethrin – an additional management concern. The resistant strains avoid deltamethrin‐sprayed grains and are less nutritionally affected by this compound, with divergent responses from the susceptible strain with increased doses of deltamethrin. Furthermore, the higher relative growth rate and consequently higher efficiency of food conversion observed in the insecticide‐resistant strains were significant even without insecticide exposure, indicating that these traits are stimulus‐independent and may persist even without further insecticide selection, potentially limiting the options available for their management.
dc.formatpdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherJournal of Applied Entomology
dc.relationVolume 133, Issue 7, Pages 524– 532, August 2009
dc.rightsOpen Access
dc.subjectBehavioural resistance
dc.subjectFeeding behaviour
dc.subjectFood conversion
dc.subjectInsecticide avoidance
dc.subjectInsecticide resistance
dc.subjectStored grains
dc.titleDeltamethrin‐induced feeding plasticity in pyrethroid‐susceptible and ‐resistant strains of the maize weevil, Sitophilus zeamais
dc.typeArtigo


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