An assessment of the chronic toxicity of fenpyroximate and pyridaben to Tetranychus urticae using a demographic bioassay

Minsik Kim, Dongyoung Shin, Eunho Suh, Ki Jong Cho

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Demographic bioassays were carried out in the laboratory to assess the demographic responses of Tetranychus urticae Koch to fenpyroximate and pyridaben at three levels of sublethal concentrations (LC10, LC30 and LC50). Life table data were used to generate an age-classified projection model in each sublethal treatment. The elasticity of population growth rate (λ) to changes in each of the individual life traits was calculated. Exposure to fenpyroximate and pyridaben treatments reduced the net reproduction rate (Ro) in a concentration-dependent manner. The treatment of pyridaben had dramatic effects on egg hatchability. The hatch rate dropped from 0.83 at untreated control to 0.27 at LC10. Two different scales of population-level endpoint were estimated to compare the total effect on T. urticae between the treatments: the first endpoint, λ values were determined based on the net reproductive rate (fecundity λ); the second endpoint incorporated the mean egg infertility rate into the net reproductive rate (vitality λ). The fecundity λ decreased in a concentration-dependent manner in both acaricide treatments, but the vitality λ decreased abruptly after treatment of pyridaben. The relative difference between the two λ values was great in pyridaben treatment. Contributions of survival probability (Pi) and fertility (F i) to the population growth rate were markedly different between the two population-level endpoints. In fecundity λ, the contribution of Fi to the λ was always higher than that of Pi. These dramatic changes in elasticity patterns reveal that acaricide effects at the population-level are strongly dependent on the life history characteristics of T. urticae and mode of action of the chemicals.

Original languageEnglish
Pages (from-to)401-409
Number of pages9
JournalApplied Entomology and Zoology
Volume39
Issue number3
DOIs
Publication statusPublished - 2004 Aug 1

Fingerprint

fenpyroximate
pyridaben
chronic toxicity
Tetranychus urticae
endpoints
demographic statistics
bioassays
fecundity
acaricides
elasticity (mechanics)
population growth
egg hatchability
life tables
lethal concentration 50
mechanism of action
life history

Keywords

  • Demographic bioassay
  • Elasticity
  • Finite rate of increase
  • Meti-acaricide
  • Two-spotted spider mite

ASJC Scopus subject areas

  • Insect Science

Cite this

An assessment of the chronic toxicity of fenpyroximate and pyridaben to Tetranychus urticae using a demographic bioassay. / Kim, Minsik; Shin, Dongyoung; Suh, Eunho; Cho, Ki Jong.

In: Applied Entomology and Zoology, Vol. 39, No. 3, 01.08.2004, p. 401-409.

Research output: Contribution to journalArticle

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