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Related Experiment Videos

Multiple plant exploiters on a shared host: testing for nonadditive effects on plant performance.

Valérie Fournier1, Jay A Rosenheim, Jacques Brodeur

  • 1Department of Entomology, University of California, Davis 95616, USA. valfourn@rci.rutgers.edu

Ecological Applications : a Publication of the Ecological Society of America
|January 9, 2007
PubMed
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Plant parasites like mites and powdery mildew interact, with mites reducing mildew growth. Their combined impact on papaya plants is largely additive, influencing plant performance and interactions.

Area of Science:

  • Plant Pathology
  • Ecology
  • Entomology

Background:

  • Plants frequently face multiple parasites, leading to additive, synergistic, or antagonistic impacts on performance.
  • Statistical models exist for testing additive effects, but natural history should guide model selection.

Purpose of the Study:

  • To investigate the interactions between the herbivorous mite Calacarus flagelliseta and the fungal pathogen Oidium caricae on the host plant Carica papaya.
  • To determine if the combined impact of these parasites on plant performance is additive or nonadditive.
  • To explore plant compensatory responses to combined parasite attack.

Main Methods:

  • In-field manipulative experiments were conducted in Hawaii.
  • The study examined the effects of herbivorous mites and powdery mildew, both individually and in combination, on papaya plants.

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  • Statistical analyses were used to assess parasite impacts and interactions.

    • Main Results:

    • Herbivorous mites negatively affected powdery mildew, reducing colony size and number.
    • Both mites and powdery mildew significantly reduced plant performance when present alone.
    • The combined impact of mites and mildew on plant performance was predominantly additive, with some instances of less-than-additive effects.
    • No evidence of nonlinear plant compensatory responses to cumulative parasite impact was found.

    Conclusions:

    • The interaction between Calacarus flagelliseta and Oidium caricae influences their population dynamics and impact on Carica papaya.
    • Understanding additive and nonadditive effects of multiple parasites is crucial for plant health and agricultural management.
    • Natural history context is vital for selecting appropriate statistical models to study plant-parasite interactions.