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Relationship between dispersal and fecundity ofTetranychus urticae Koch (Acari: Tetranychidae) exposed to flucythrinate

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Abstract

The effects of the synthetic pyrethroid flucythrinate on dispersal and fecundity of the two-spotted spider mite,Tetranychus urticae Koch, was investigated using a vial exposure technique that allowed treatment of mites without incidental treatment of host plant and allowed determination of the actual dose received by the mites. Flycythrinate elicited both immediate and delayed dispersal. Immediate dispersal within 120 min posttreatment was more sensitive than delayed dispersal and fecundity at 24, 48, and 72 h posttreatment. The lowest flucythrinate concentrations elicited immediate dispersal without subsequent inhibition of fecundity, providing support for the hypothesis that pyrethroid-induced mite population outbreaks can result from dispersal of healthy mites to areas of low competition. Delayed dispersal, however, was observed only in mites that had reduced fecundity. No significant increases in egg production were observed; however, mites exposed to the lowest concentrations of flucythrinate showed a trend toward increased fecundity at 48 and 72 h posttreatment. Since the mites were treated rather than the host plant, it appeared that the dispersal associated with flucythrinate was manifested primarily through a general stimulation of locomotor activity rather than directional locomotor response.

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Authors and Affiliations

  1. Department of Entomology, University of Missouri, 1-87 Agriculture Building, 65211, Columbia, MO, (USA)

    Michael J. Mckee, Yusof B. Ibrahim & Charles O. Knowles

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  1. Michael J. Mckee
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  2. Yusof B. Ibrahim
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  3. Charles O. Knowles
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Contribution from the Missouri Agricultural Experiment Station, Columbia, MO, Journal Series No. 10037.

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Mckee, M.J., Ibrahim, Y.B. & Knowles, C.O. Relationship between dispersal and fecundity ofTetranychus urticae Koch (Acari: Tetranychidae) exposed to flucythrinate. Exp Appl Acarol 3, 1–10 (1987). https://doi.org/10.1007/BF01200408

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  • DOI: https://doi.org/10.1007/BF01200408

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