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Pyrethroid resistance vs susceptibility in Sitophilus zeamais Motschulsky Coleoptera Curculionidae Is there a winner?


Pyrethroid resistance vs susceptibility in Sitophilus zeamais Motschulsky Coleoptera Curculionidae Is there a winner?



Neotropical Entomology 34.6 (November-December): 981-990



ISSN/ISBN: 1519-566X

Studies on insecticide resistance evolution usually associate the phenomenon with an adaptative cost to the individual carrying this trait. Our objective was to verify if insecticide resistance in a population of Sitophilus zeamais Motschulsky incurs in fitness cost under an insecticide-free environment. Two populations of the species (a susceptible and a pyrethroid resistant population) were submitted to competition against each other for two consecutive generations in the absence of insecticide. A factorial bivariated derivated from an additive series was used in the experimental design with two initial density levels (lower, with 50 individuals of one population and a crescent series of individuals from 0 to 50 from the other population; and higher, with 100 individuals of a population and a crescent series of individuals from 0 to 100 from the other). The total number of adult insects, mortality by deltamethrin and insect body mass for each treatment were recorded. Adaptative disadvantage was not found on the resistant population compared with the susceptible population in an insecticide-free environment since both populations showed similar growth rate. This finding brings about practical complications for insecticide resistance management in this species because management strategies based on the interruption of pyrethroid use aiming their future reintroduction may not achieve the desired effects. This may take place because even after a long period without insecticide use, the resistant populations may still maintain themselves as such since there is no perceptible adaptative disadvantage associated with this trait.

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Accession: 037459390

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Pyrethroid resistance vs susceptibility in Sitophilus zeamais Motschulsky Coleoptera Curculionidae Is there a winner? Resistencia vs susceptibilidade a piretroides em Sitophilus zeamais Motschulsky Coleoptera Curculionidae ha vencedor?. Neotropical Entomology. November-December; 346: 981-990, 2005

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