Rate of Population Increase of the Twospotted Spider Mite (Acari: Tetranychidae) on Peanut Leaves Treated with Pesticides1

Boykin, L. S.; Campbell, W. V.

doi:10.1093/jee/75.6.966

Cited by 32 publications

(13 citation statements)

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“…Tetranychus urticae Koch is an arthropod pest distributed over temperate and subtropical zones (Boykin and Campbell, 1982;Luczynski et al, 1990;Liu et al, 2002), and can live on a wide range of flowering plants (Maggi and Leigh, 1983;Sonneveld et al, 1996;He et al, 2001). T. urticae is one of the most damaging pests of apple in Northwest China.…”

Section: Introductionmentioning

confidence: 99%

Effects of predator-mediated apparent competition on the population dynamics of Tetranychus urticae on apples

Liu

Lin

et al. 2006

Biocontrol

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The two spotted spider mite, Tetranychus urticae Koch, is an important herbivore pest of apple trees in Northwest China. This spider mite and another less damaging spider mite, Eotetranychus pruni Oudemans, are attacked by a common and often effective phytoseiid predator, Euseius finlandicus (Oudemans). Functional relationships were studied in the field to evaluate the impact of E. pruni and E. finlandicus on T. urticae. The results from this study showed that the predator-mediated apparent competition strongly affected the population dynamics of T. urticae. The addition of the apparent competitor E. pruni alone had little impact on T. urticae densities. Although the release of the predator E. finlandicus alone could result in reduction in T. urticae densities, the greatest reduction in T. urticae densities occurred in plots where both the predator E. finlandicus and apparent competitor E. pruni were released. In apple orchards, the early introduction of both the apparent competitor E. pruni and predator E. finlandicus would evidently increase the population size of the predator E. finlandicus and consequently significantly enhance the control of T. urticae populations. It is concluded from the study that the predator and apparent competitor release might be an appropriate control for the target species.

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Section: Introductionmentioning

confidence: 99%

Effects of predator-mediated apparent competition on the population dynamics of Tetranychus urticae on apples

Liu

Lin

et al. 2006

Biocontrol

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“…Several reports on demographic techniques regarding sublethal effects of acaricides on spider mites have been published thus far (Boykin and Campbell 1982;Ahmadi 1983;Jones and Parrella 1984;Ibrahim and Knowles 1986;Flores et al 2000;Marcic 2003;Kim et al 2004;Martinezvellar et al 2005), none of which simultaneously considered hawthorn spider mite and clofentezine. Marcic (2003) reported effects of clofentezine on lifetable parameters of T. urticae females that survived a concentration causing ‡90% mortality at one of the developmental stages.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Sublethal Effects of Clofentezine on Life-table Parameters in Hawthorn Spider Mite (Tetranychus viennensis)

2006

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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. the control, while R(0) in unexposed LC(50) offspring was significantly higher than their mother's, but lower than that in the control. These changing patterns of r(m) reveal that acaricide effects at the population level strongly depend on the life-history characteristics of T. viennensis and the chemical mode of action.

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“…Several studies using demographic techniques to quantify sublethal effects of pesticides on spider mites have been reported (Boykin and Campbell 1982;Ahmadi 1983;Jones and Parrella 1984;Ibrahim and Knowles 1986;Stark et al 1997;Marcic 2003) but none have considered azadirachtin. Therefore, we evaluated the effects of this compound against adult T. urticae, using demographic toxicological analysis and speculate the possibility of incorporating azadirachtin in the management of the two-spotted spider mite.…”

Section: Introductionmentioning

confidence: 99%

Effects of azadirachtin on the two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae)

et al. 2005

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Effects of sublethal azadirachtin exposure to the biological performance of Tetranychius urticae Koch was studied under laboratory conditions. Bioassay was used to asses the effect of different concentrations of azadirachtin on longevity, fecundity, fertility, and offspring development. Azadirachtin (64 and 128 ppm) affected fecundity and mortality but had no effect on fertility and offspring development. A subsequent life-table study with 80 ppm of azadirachtin found that the compound caused a reduction of 50% in survival to adult stage. The peak of reproduction was reached at 5 days causing a decrease in the mean fecundity to almost eight times than of untreated females. The net reproductive rate (R0), the intrinsic rate of increase (r(m)), and the finite rate of increase (lambda) of treated females were lower. Treatment showed a negative value of r(m), resulting in a declining population. These results suggest that azadirachtin could be incorporated in Integrated Pest Management (IPM) programmes of T. urticae.

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Rate of Population Increase of the Twospotted Spider Mite (Acari: Tetranychidae) on Peanut Leaves Treated with Pesticides1

Cited by 32 publications

References 0 publications

Effects of predator-mediated apparent competition on the population dynamics of Tetranychus urticae on apples

Effects of predator-mediated apparent competition on the population dynamics of Tetranychus urticae on apples

Assessment of Sublethal Effects of Clofentezine on Life-table Parameters in Hawthorn Spider Mite (Tetranychus viennensis)

Effects of azadirachtin on the two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae)

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