Assessment of sublethal effects of clofentezine on life-table parameters in Hawthorn spider mite (Tetranychus viennensis).

Experimental & Applied Acarology
Dingxu LiZuorui Shen

Abstract

A leaf disc bioassay was employed in the laboratory to assess the population responses of Tetranychus viennensis Zacher to clofentezine at three concentrations (LC(10), LC(25) and LC(50)) in three successive generations. Life-table parameters were calculated in each acaricide exposure regime and compared by jackknife procedures. Clofentezine treatments in the juvenile stages significantly delayed development of the mites, and this delay increased with increasing dose but decreased as the mites developed. Exposure to clofentezine reduced the net reproduction rate (R(0)) in a concentration-dependent manner. The LC(50) treatment had strong effects on the hatchability of eggs produced by surviving females. Hatch rate dropped from 0.83 in the untreated control to 0.51 in the third generation. When exposed to constant concentrations of clofentezine in three successive generations, the intrinsic rate of increase and R(0) of the mites decreased significantly, but they increased significantly when exposed to decreasing concentrations. Unexposed offspring of the exposed mother also displayed increases in R(0) and the jackknife procedures indicated no significant differences in R(0) between LC(10) and LC(25) offspring and their mothers vs...Continue Reading

References

Mar 26, 1999·Ecotoxicology and Environmental Safety·J D Stark, J A Banken
Sep 11, 2002·Annual Review of Entomology·John D Stark, John E Banks
Mar 29, 2005·Experimental & Applied Acarology·Elena Martínez-VillarIgnacio Pérez-Moreno

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Citations

Nov 15, 2008·Experimental & Applied Acarology·Adenir V TeodoroClaudinei Oliveira
Mar 17, 2007·Clinical Implant Dentistry and Related Research·Irene HerrmannUlf Lekholm

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