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Testing for Non-target Effects of Spinosad on Twospotted Spider Mites and their Predator Phytoseiulus persimilis under Greenhouse Conditions

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Abstract

The compatibility of the selective insecticide spinosad (Conserve SC®), at rates recommended for thrips control in greenhouses, with release of the predatory mite Phytoseiulus persimilis Athias-Henriot (Acari: Phytoseiidae) to control spider mites, was investigated in a crop of ivy geranium Pelargonium peltatum, cultivar ‘Amethyst 96.’ Plants were inoculated with twospotted spider mites, Tetranychus urticae Koch (Acari: Tetranychidae), 2 weeks before treatments were applied. There were three treatment variables, each at two levels: predators (released or not), spray application (water or Conserve SC® at 2 ml/3.79 l), and timing of spray (1 day before or after predators were released). Twospotted spider mite populations then were sampled twice each week over a three-week period. The application or timing of spinosad had no effect on the ability of the predator to reduce the population of spider mites. Spider mite populations in the no-predator treatment continued to expand over the course of the experiment, while those in the predator-release treatment declined. We conclude that P. persimilis can be used in conjunction with spinosad on ivy geraniums without causing obvious detrimental effects to this predator or leading to a reduction in biological control.

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  1. Department of Entomology, Kansas State University, 123 West Waters Hall, Manhattan, KS, 66506, USA

    Kiffnie M. Holt, George P. Opit, James R. Nechols & David C. Margolies

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  1. Kiffnie M. Holt
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  2. George P. Opit
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  3. James R. Nechols
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  4. David C. Margolies
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Correspondence to David C. Margolies.

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Holt, K.M., Opit, G.P., Nechols, J.R. et al. Testing for Non-target Effects of Spinosad on Twospotted Spider Mites and their Predator Phytoseiulus persimilis under Greenhouse Conditions. Exp Appl Acarol 38, 141–149 (2006). https://doi.org/10.1007/s10493-006-0018-y

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