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Apparent competition or apparent mutualism? An analysis of the influence of rose bush strip management on aphid population in wheat field

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Frere, Isabelle [UCL] Fabry, Jean [UCL] Hance, Thierry [UCL]

Apparent competition, mediated by a shared predator, plays a key role in conservation biological control. Appropriate agroecosystems management may favour this type of indirect interaction. In that context, our aim was to test the effect of rose bush [Rosa rugosa (Thunb.)] strips on the building up of aphid populations and of their natural enemies in adjacent cereal habitats. Several aphid species are currently found on Rosa sp. including Metopolophium dirhodum (Walker) for which it is a primary host. Aphid predators and parasitoids may build their populations on the aphid population present on Rosa sp. and later on migrate to wheat field during the cereal aphid infestation. Moreover, the flowers of the rose bushes may provide a source of nectar and pollen to these natural enemies. Our experiment was conducted in three rose margin wheat plots with a strip of rose bushes of R. rugosa and three control plots. Plots were compared during 2 years (2003 and 2004). Aphid, parasitoid and predator densities were recorded from May to the harvest of wheat on rose bushes and in wheat. In 2003, the aphid densities were moderate but in 2004, the population of aphid was very high. Even if predator and parasitoids arrived earlier in rose margin field than in control ones, the presence of rose bushes did not influence the aphid population within the field. Metopolophium dirhodum did not seem to migrate from the rose bushes to wheat. The level of parasitism was weak in rose bushes and the natural enemy population was not different in rose margin wheat and in control plots. The causes of the lack of efficiency of this type of management are discussed as well as the high aphid population in wheat in 2004.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2007
Language Anglais
Journal information "Journal of Applied Entomology" - Vol. 131, no. 4, p. 275-283 (2007)
Peer reviewed yes
Publisher Blackwell Publishing (Oxford)
issn 0931-2048
e-issn 1439-0418
Publication status Publié
Affiliations UCL - SC/BIOL - Département de biologie
UCL - SST/ELI/ELIB - Biodiversity
Keywords rose ; biological control ; parasitoid ; aphid ; apparent competition
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Bibliographic reference Frere, Isabelle ; Fabry, Jean ; Hance, Thierry. Apparent competition or apparent mutualism? An analysis of the influence of rose bush strip management on aphid population in wheat field. In: Journal of Applied Entomology, Vol. 131, no. 4, p. 275-283 (2007)
Permanent URL http://hdl.handle.net/2078.1/37660