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Population dynamics of interacting predatory mites, Phytoseiulus persimilis and Neoseiulus californicus, held on detached bean leaves

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Abstract

The success of combined release of the predatory mitesPhytoseiulus persimilis and Neoseiulus californicus insuppression of spider mites may be related to the effects of the interactionsbetween the two predators on their population dynamics. We studied populationgrowth and persistence of the specialist P. persimilis andthe generalist N. californicus reared singly versus rearedin combination after simultaneous and successive predator introductions ondetached bean leaf arenas with abundant prey, Tetranychusurticae, and with diminishing prey. When reared singly with abundantprey, either predator population persisted at high densities to the end of theexperiment. In every predator combination system with abundant prey and variousinitial predator:predator ratios N. californicus displacedP. persimilis. When held singly with diminishing prey, thepopulation of P. persimilis grew initially faster than thepopulation of N. californicus but both species reachedsimilar population peaks. Irrespective whether reared singly or in combination,N. californicus persisted three to five times longer afterprey depletion than did P. persimilis. Regarding thecrucial interactions in the predator combination systems, we conclude thatintraguild predation was a stronger force than food competition and finallyresulted in the displacement of P. persimilis. Previousstudies showed that intraguild predation between the specialist P.persimilis and the generalist N. californicusisstrongly asymmetric favoring the generalist. We discuss the implications ofpotential interactions between P. persimilis andN. californicus to biological control of spider mites.

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Authors and Affiliations

  1. Deptartment of Horticulture, Institute of Horticulture and Fruit Growing, University of Agricultural Sciences, Peter Jordanstrasse 82, 1190, Vienna, Austria

    A. Walzer & P. Schausberger

  2. Institute of Phytomedicine, Federal Office and Research Centre for Agriculture, Spargelfeldstrasse 191, 1226, Vienna, Austria

    S. Blümel

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  1. A. Walzer
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  2. S. Blümel
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  3. P. Schausberger
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Walzer, A., Blümel, S. & Schausberger, P. Population dynamics of interacting predatory mites, Phytoseiulus persimilis and Neoseiulus californicus, held on detached bean leaves. Exp Appl Acarol 25, 731–743 (2001). https://doi.org/10.1023/A:1016332129137

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