African Entomology (2000) 8, 57-61

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G.J. Prinsloo (2000)
Host and host instar preference of Aphelinus sp. nr. varipes (Hymenoptera: Aphelinidae), a parasitoid of cereal aphids (Homoptera: Aphididae) in South Africa
African Entomology 8 (1), 57-61
Abstract: Host preferences of the aphelinid parasitoid, Aphelinus sp. nr. varipes, on the wheat aphids Diuraphis noxia (Kurdjumov), Schizaphis graminum (Rondani), Rhopalosiphum padi (Linnaeus), Sitobion avenae (Fabricius) and Metopolophium dirhodum (Walker) were tested in the laboratory. This parasitoid was introduced from the Ukraine where it was collected from D. noxia. An instar preference test was also conducted with D. noxia as host aphid. Preference for oviposition on a particular instar of the aphid could not be demonstrated. Before preference tests were conducted, the Aphelinus sp. was preconditioned on each aphid species. The parasitoid failed to complete its development on R. padi and S. avenae. During the preference test, however, parasitoid females did oviposit in each of the five wheat aphid species. Regardless of the aphid species on which the parasitoid was reared, significantly more eggs were laid in D. noxia, showing a significant preference for oviposition on this species. No clear preference was found for feeding on a specific aphid species.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Goddy J. Prinsloo

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Diuraphis noxia Wheat (Triticum) South Africa
Sitobion avenae Wheat (Triticum) South Africa
Rhopalosiphum padi Wheat (Triticum) South Africa
Schizaphis graminum Wheat (Triticum) South Africa
Metopolophium dirhodum Wheat (Triticum) South Africa