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Impact of intraguild predation and lambda‐cyhalothrin on predation efficacy of three acarophagous predators
Author(s) -
Provost Caroline,
Coderre Daniel,
Lucas Éric,
Chouinard Gérald,
Bostanian Noubar J
Publication year - 2005
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1027
Subject(s) - intraguild predation , predation , biology , harmonia axyridis , tetranychus urticae , phytoseiidae , biological pest control , predator , coccinellidae , aphid , ecology , zoology , botany , mite
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