Impact of intraguild predation and lambda-cyhalothrin on predation efficacy of three acarophagous predators

Authors

  • Caroline Provost,

    Corresponding author
    1. Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888 Succursale ‘Centre-ville’, Montréal, Québec, Canada H3C3P8
    • Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888, Succursale ‘Centre-ville’, Montréal, Québec, Canada H3C3P8
    Search for more papers by this author
  • Daniel Coderre,

    1. Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888 Succursale ‘Centre-ville’, Montréal, Québec, Canada H3C3P8
    Search for more papers by this author
  • Éric Lucas,

    1. Département des Sciences Biologiques, Université du Québec à Montréal, CP 8888 Succursale ‘Centre-ville’, Montréal, Québec, Canada H3C3P8
    Search for more papers by this author
  • Gérald Chouinard,

    1. Institut de Recherche et de Développement en Agroenvironnement, 3300 Sicotte, Saint-Hyacinthe, Québec, Canada J2S 7B8
    Search for more papers by this author
  • Noubar J Bostanian

    1. Horticultural Research and Development Centre, Agriculture and Agri-Food Canada, 430 Gouin Blvd, St-Jean-sur-Richelieu, Québec, Canada J3B 3E6
    Search for more papers by this author

Abstract

This laboratory study reports the interaction of three predators found in commercial apple orchards in Quebec, Hyaliodes vitripennis (Say) (Hemiptera: Miridae), Harmonia axyridis Pallas (Coleoptera: Coccinellidae) and Amblyseius fallacis (Garman) (Acarina: Phytoseiidae). First, intraguild predation between H vitripennis and the two other predators was characterized in the absence and presence of their extraguild prey, Tetranychus urticae Koch. The results showed an asymmetrical interaction in favour of the larger predator and the levels of intraguild predation were weak for the two predatory combinations. Presence of the phytophagous mite reduced the intensity of intraguild predation in the predatory combination of H axyridis and H vitripennis. Second, the effects of intraguild predation and the application of lambda-cyhalothrin on predation efficacy of the predators were evaluated. The application of the insecticide reduced prey consumption of H vitripennis and H axyridis but did not affect that of A fallacis. Combination of predators and an insecticide application resulted in two different situations depending on the species involved: a reduced predation efficacy for the combination of H vitripennis and H axyridis due to a knockdown effect caused by the insecticide, and no effect on T urticae consumption for H vitripennis and A fallacis. It is suggested that an integrated pest management program based on H vitripennis, A fallacis and lambda-cyhalothrin may be evaluated to repress phytophagous mites in Quebec orchards. Copyright © 2005 Society of Chemical Industry

Ancillary