Ground-dwelling predators can affect within-field pest insect emergence in winter oilseed rape fields |
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Authors: | Johann G Zaller Dietmar Moser Thomas Drapela Thomas Frank |
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Institution: | (1) Institute of Zoology, University of Natural Resources and Applied Life Sciences Vienna, Gregor Mendel Strasse 33, Vienna, 1180, Austria |
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Abstract: | We investigated, (i) whether the emergence from pupation of two coleopteran pest insect groups in oilseed rape (OSR, Brassica napus L.)—pollen beetles (Meligethes spp. F., Nitidulidae) and stem weevils (Ceutorhynchus pallidactylus Marsh and C. napi Gyll., Curculionidae)—is affected by the exclusion of ground-dwelling predatory arthropods, and (ii) the role for pest control
of the widely abundant carabid beetles Anchomenus dorsalis Pontop. and Poecilus cupreus L. Densities of ground-dwelling arthropods were manipulated using enclosures; emerging pest adults were assessed using emergence
traps. Where arthropods had been excluded, between two (June sampling) and tenfold (August sampling) more stem weevils emerged
than where predators had free access. The addition of 25 adult A. dorsalis m−2 to formerly predator-free enclosures showed similar stem weevil emergence than plots where predators had free access; the
addition of 25 adult P. cupreus m−2 did not reduce stem weevil emergence. In August, both A. dorsalis and P. cupreus additions marginally significantly reduced pollen beetle emergence.
Handling editor: Patrick De Clercq. |
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Keywords: | Anchomenus dorsalis Brassica napus Canola Ceutorhynchus napi Ceutorhynchus pallidactylus Ground beetles Meligethes aeneus Oilseed crop Pest– predator interactions Pest antagonists Poecilus cupreus |
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