title: Life table study of the effects of sublethal concentrations of thiamethoxam on Bradysia odoriphaga Yang and Zhang.
abstract: Bradysia odoriphaga Yang and Zhang (chive gnat) is the major insect pest affecting Chinese chive in Northern China. In order to explore the integrated control of B. odoriphaga, sublethal effects of the neonicotinoid insecticide thiamethoxam were studied. The standard contact and stomach bioassay method was used to assess the effects of sublethal (LC5 and LC20) concentrations of thiamethoxam on the demographic parameters of B. odoriphaga, and data were interpreted based on the age-stage, two-sex life table theory. After thiamethoxam treatment, the intrinsic and finite rates of increase, net reproduction rate, survival rate, and reproductive value were all markedly decreased, while the mean generation time, total preovipositional period, and larval and pupal duration were prolonged, compared with controls. The intrinsic rates of increase dropped from 0.1775/day to 0.1502-0.1136/day. Following LC5 and LC20 treatments, net reproduction rate dropped from 61.75 offspring/individual (control) to 43.36 and 20.75 offspring/individual, respectively. Sublethal concentrations of thiamethoxam decreased the developmental rate of laboratory populations of B. odoriphaga, suggesting that such doses may be useful in integrated pest management strategies.
authors.affiliation: College of Plant Protection, Key Laboratory of Pesticide Toxicology & Application Technique, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.affiliation: College of Plant Protection, Key Laboratory of Pesticide Toxicology & Application Technique, Shandong Agricultural University, Tai'an, Shandong 271018, PR China. Electronic address: fliu@sdau.edu.cn.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.affiliation: College of Plant Protection, Key Laboratory of Pesticide Toxicology & Application Technique, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Mu
authors.affiliation: College of Plant Protection, Key Laboratory of Pesticide Toxicology & Application Technique, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors.forename: Qiuhong
authors.initials: Q
authors.lastname: Wang
authors.affiliation: College of Plant Protection, Key Laboratory of Pesticide Toxicology & Application Technique, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: College of Plant Protection, Key Laboratory of Pesticide Toxicology & Application Technique, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors.forename: Chengyu
authors.initials: C
authors.lastname: Chen
mesh_terms: D000818:Animals; D027782:Chive / Q000469:parasitology; D004175:Diptera / Q000187:drug effects* / Q000254:growth & development* / Q000502:physiology; D005260:Female; D007306:Insecticides / Q000633:toxicity*; D007814:Larva / Q000187:drug effects / Q000254:growth & development; D008297:Male; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000633:toxicity*; D010078:Oxazines / Q000633:toxicity*; D010935:Plant Diseases / Q000469:parasitology; D011679:Pupa / Q000187:drug effects / Q000254:growth & development; D012098:Reproduction / Q000187:drug effects; D000077922:Thiamethoxam; D013844:Thiazoles / Q000633:toxicity*
chemical_list: D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010078:Oxazines; D013844:Thiazoles; D000077922:Thiamethoxam
keywords: Bradysia odoriphaga Yang and Zhang; Chinese chive; Neonicotinoid; Sublethal concentration; Thiamethoxam; Two-sex life table