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The effect of semi-natural habitats on aphids and their natural enemies across spatial and temporal scales

Alignier, Audrey and Raymond, Lucie and Deconchat, Marc and Menozzi, Philippe and Monteil, Claude and Sarthou, Jean-Pierre and Vialatte, Aude and Ouin, Annie The effect of semi-natural habitats on aphids and their natural enemies across spatial and temporal scales. (2014) Biological Control, vol. 77. pp. 76-82. ISSN 1049-9644

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Official URL: http://dx.doi.org/10.1016/j.biocontrol.2014.06.006

Abstract

Semi-natural habitats in agricultural landscapes are generally assumed to enhance the biological control of insect pests based on native beneficial insects, by providing alternative prey and hosts, resources and refuges for overwintering. We hypothesized that natural enemies of winter wheat aphids should arrive sooner in fields near semi-natural habitats. We compared aphid, hoverfly (larvae and eggs) and parasitized aphid (mummies) abundances in 54 winter wheat fields located in southern France from 2003 to 2007. Six surveys were recorded each spring and were split into the early period (defined as the period before the peak of aphid growth) and the late period (after the peak). The wheat fields differed by their surrounding landscape composition measured as the proportion of semi-natural habitats (woods, hedges and grasslands), at three different spatial scales: 200 m, 500 m, and 1200 m. Despite great variability in abundance data between years, the abundance of hoverflies appeared more sensitive to landscape composition than aphid abundance was. Early abundance for both aphids and hoverflies was positively related to wood cover, but not late abundance in spring. The abundance of hoverflies was positively related to hedge and grassland cover at all spatial scales and both periods considered. Aphid parasitism was higher near hedges at the small spatial scale late in the spring. Our results confirmed that higher proportions of semi-natural habitats in agricultural landscapes enhance the biological control of pests, but this effect depends on the spatial scale, the time period in the spring and the natural enemies considered.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S1049964414001273.
HAL Id:hal-01535632
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
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Deposited By: Kattialyn GOSSIAUX
Deposited On:09 Jun 2017 09:35

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