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Occurrence of Steinernema species in cabbage fields and the effect of inoculated S. feltiae on Delia radicum and its parasitoids

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1 Seven organically grown cabbage fields were surveyed for entomopathogenic nematodes in the autumn by baiting. Nematodes were obtained from three fields with bait larvae infection ranging from 1.3–4.0%.

2 Inoculation of Steinernema feltiae (Rhabditida: Steinernematidae) in the spring increased bait larvae infection to 16.0–32.0%.

3 Four different species were found (Steinernema affine, Steinernema bicornutum, S. feltiae and Steinernema C1).

4 The number of Delia radicum (L.) (Diptera: Anthomyiidae) puparia was significantly reduced at plants where S. feltiae had been inoculated.

5 Delia radicum parasitoids were also affected by S. feltiae. The results indicated that Aleochara species (Coleoptera: Staphylinidae) were more negatively affected than Trypliographa rapae (Westw.) (Hymenoptera: Cynipidae).
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Keywords: Aleochara spp; Delia radicum; S. bicornutum; S. feltiae; Steinernema C1; Steinernema affine; Trypliographa rapae; cabbage; entomopathogenic nematodes; parasitoids

Document Type: Research Article

Affiliations: Zoology Section, Department of Ecology, The Royal Veterinary and Agricultural University, Thorvaldsensvej 40, 3. DK-1871 Frederiksberg C, Denmark

Publication date: 2004-02-01

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