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How predatory mites find plants with whitefly prey.

Maria Nomikou1, Ruixia Meng, Ruud Schraag

  • 1IBED, Population Biology, University of Amsterdam, P.O. Box 94084, 1090 Amsterdam, GB, The Netherlands.

Experimental & Applied Acarology
|September 1, 2005
PubMed
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Predatory mites Typhlodromips swirskii and Euseius scutalis were released to control whiteflies. They found infested plants more often, suggesting they are arrested by prey, not just attracted from afar.

Area of Science:

  • Agricultural Entomology
  • Biological Control
  • Chemical Ecology

Background:

  • Bemisia tabaci (whitefly) is a significant agricultural pest.
  • Typhlodromips swirskii and Euseius scutalis are predatory mites used for biological control of whiteflies.
  • Understanding predator searching behavior is crucial for effective biological control strategies.

Purpose of the Study:

  • To investigate the searching behavior of Typhlodromips swirskii and Euseius scutalis in relation to Bemisia tabaci.
  • To determine if mites are attracted to or arrested by whitefly-infested plants.
  • To assess the role of olfactory cues in predator-prey location.

Main Methods:

  • Greenhouse release experiments with mites on clean and whitefly-infested cucumber plants.

Related Experiment Videos

  • Y-tube olfactometer experiments to test attraction to volatiles from infested plants.
  • Analysis of predator recapture rates and distribution on plants.

    • Main Results:

    • Both mite species were recaptured significantly more on plants with whiteflies, indicating discrimination.
    • While experienced T. swirskii showed attraction to volatiles, inexperienced mites relied more on arrestment at prey plants.
    • Predatory mite searching effectiveness was lower than whitefly recapture rates, suggesting potential spatial dynamics.

    Conclusions:

    • Predatory mites likely locate prey through random searching followed by differential arrestment on infested plants.
    • Olfactory cues play a role, but arrestment appears more significant for inexperienced predators in greenhouse settings.
    • The search inefficiency of mites compared to whiteflies may influence biological control dynamics and pest population patterns.