Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/19175
Tipo: Artigo
Título: Stimulatory sublethal response of a generalist predator to permethrin: hormesis, hormoligosis, or homeostatic regulation?
Autor(es): Guedes, R.N.C.
Magalhães, L. C.
Cosme, L. V.
Abstract: The assessment of pesticide effects in arthropods historically have relied heavily on acute lethal effects. Although the sublethal responses to such compounds are sometimes neglected, stimulatory effects associated with low doses of compounds toxic at higher doses, such as pesticides, have been widely reported in recent years and recognized as a general toxicological phenomenon. Evidence of such stimulatory response has also been reported among mites and a few insect pestspecies exposed to pesticides and recognized as a one of the potential causes underlying pest resurgence and secondary pest outbreaks. However, Þtness parameters and its implications were seldom considered in these studies and natural enemies are not usually target of attention. Here, we reported the stimulatory effect of sublethal doses (ranging from 0.02 to 172.00 ppb in addition to the control) of the pyrethroid permethrin topically applied to third instar nymphs of the spined soldier bug, Podisus distinctus (Stål) (Heteroptera: Pentatomidae). The parameters estimated from the fertility tables of insects exposed to the increasing doses of insecticide indicated a slight increase in the mean survival time for doses ⱖ0.20 ppb and a peak in the net reproductive rate at 1.72 ppb. This trend is coincident and correlated with the intrinsic rate of population growth (n ⫽ 18, r ⫽ 0.78, P ⫽ 0.0001), which also shows a peak at 1.72 ppb, leading to higher reproductive values of insects exposed to this dose. The phenomenon is consistent with insecticide-induced hormesis, for which the potential implications are discussed.
Palavras-chave: Dose response
Fertility table
Fitness
Pest resurgence
Natural enemy
Editor: Journal of Economic Entomology
Tipo de Acesso: Entomological Society of America
URI: https://doi.org/10.1603/029.102.0124
http://www.locus.ufv.br/handle/123456789/19175
Data do documento: 5-Set-2008
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