title: Sublethal and hormesis effects of imidacloprid on the soybean aphid Aphis glycines.
abstract: The soybean aphid, Aphis glycines Matsumura, is a major pest in soybean crop. Current management of this pest relies mainly on insecticides applications, and the neonicotinoid imidacloprid has been proposed as an effective insecticide to control A. glycines in soybean field. Imidacloprid at lethal concentrations not only exerts acute toxicity to A. glycines, but also cause various biological changes when aphids are chronically exposed to lower concentrations. In this study, we assessed the effects of a low-lethal (0.20 mg L(-1)) and two sublethal (0.05 and 0.10 mg L(-1)) imidacloprid concentrations on various A. glycines life history traits. Aphid exposure to 0.20 mg L(-1) imidacloprid caused slower juvenile development, shorter reproductive period, and reduced adult longevity, fecundity and total lifespan. Stimulatory effects, i.e. hormesis, on reproduction and immature development duration were observed in aphids exposed to the lower sublethal imidacloprid concentrations. Consequently, the net reproduction rate (R 0) was significantly higher than in the control aphids. These findings stress the importance of the actual imidacloprid concentration in its toxicological properties on A. glycines. Therefore, our results would be useful for assessing the overall effects of imidacloprid on A. glycines and for optimizing integrated pest management programs targeting this pest.
authors.affiliation: Department of Entomology, China Agricultural University, 2 Yuanmingyuan West Road, Beijing, 100193, China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Qu
authors.forename: Da
authors.initials: D
authors.lastname: Xiao
authors.forename: Jinyu
authors.initials: J
authors.lastname: Li
authors.forename: Zhou
authors.initials: Z
authors.lastname: Chen
authors.forename: Antonio
authors.initials: A
authors.lastname: Biondi
authors.forename: Nicolas
authors.initials: N
authors.lastname: Desneux
authors.forename: Xiwu
authors.initials: X
authors.lastname: Gao
authors.forename: Dunlun
authors.initials: D
authors.lastname: Song
mesh_terms: D000818:Animals; D001042:Aphids / Q000187:drug effects* / Q000254:growth & development / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D005260:Female; D005298:Fertility / Q000187:drug effects; D059165:Hormesis / Q000187:drug effects; D007093:Imidazoles / Q000494:pharmacology*; D007306:Insecticides / Q000494:pharmacology*; D008136:Longevity / Q000187:drug effects; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000494:pharmacology*; D009758:Nymph / Q000187:drug effects / Q000254:growth & development / Q000502:physiology; D012098:Reproduction / Q000187:drug effects
chemical_list: D007093:Imidazoles; D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; C082359:imidacloprid