Intraguild interference and biocontrol effects of generalist predators in a winter wheat field

Lang, Andréas

doi:10.1007/s00442-002-1091-5

Cited by 172 publications

(146 citation statements)

References 45 publications

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“…The variability of aphid population dynamics could be due to weather conditions, particularly in winter (Thies et al, 2005). The presence or absence of generalist species controlling aphids early in the season was also pointed out to explain variability of aphid population dynamics in various studies (Plantegenest et al, 2001;Lang, 2003).…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2014

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Monteil, et al.. The effect of semi-natural habitats on aphids and their natural enemies across spatial and temporal scales. Biological Control, Elsevier, 2014, vol. 77, pp. 76-82. <10.1016/j.biocontrol.2014 .006>. Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr The effect of semi-natural habitats on aphids and their natural enemies across spatial and temporal scales Keywords: Biocontrol Landscape Seasonality Aphid Hoverfly Parasitism a b s t r a c t 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.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2014

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“…2004a, Finke and Denno 2005). Interference competition can also occur whereby one predator species reduces prey capture by the other due to negative behavioral interactions (Lang 2003). Given the complexity of these interactions, the net effect of predator species diversity is often difficult to predict.…”

Section: Introductionmentioning

confidence: 99%

Functional diversity positively affects prey suppression by invertebrate predators: a meta‐analysis

Greenop

Woodcock

Wilby

et al. 2018

Ecology

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The use of pesticides within agricultural ecosystems has led to wide concern regarding negative effects on the environment. One possible alternative is the use of predators of pest species that naturally occur within agricultural ecosystems. However, the mechanistic basis for how species can be manipulated in order to maximize pest control remains unclear. We carried out a meta‐analysis of 51 studies that manipulated predator species richness in reference to suppression of herbivore prey to determine which components of predator diversity affect pest control. Overall, functional diversity (FD) based on predator's habitat domain, diet breadth and hunting strategy was ranked as the most important variable. Our analysis showed that increases in FD in polycultures led to greater prey suppression compared to both the mean of the component predator species, and the most effective predator species, in monocultures. Further analysis of individual traits indicated these effects are likely to be driven by broad niche differentiation and greater resource exploitation in functionally diverse predator communities. A decoupled measure of phylogenetic diversity, whereby the overlap in variation with FD was removed, was not found to be an important driver of prey suppression. Our results suggest that increasing FD in predatory invertebrates will help maximize pest control ecosystem services in agricultural ecosystems, with the potential to increase suppression above that of the most effective predator species.

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“…Yet herbivore-natural enemy interactions in winter wheat, which is the dominant crop in many temperate areas, are still not sufficiently understood to predict pest outbreaks. The lack of knowledge of the relative importance of control agents and their interactions contributes to this unpredictability (Sunderland et al 1997;Fagan et al 1998;Lang 2003).…”

Section: Introductionmentioning

confidence: 99%

Relative importance of predators and parasitoids for cereal aphid control

Schmidt

Lauer

Purtauf

et al. 2003

Proc. R. Soc. Lond. B

296

249

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Field experiments with manipulations of natural enemies of plant-feeding insects may show how a diverse enemy group ensures an important ecosystem function such as naturally occurring biological pest control. We studied cereal aphid populations in winter wheat under experimentally reduced densities of: (i) ground-dwelling generalist predators (mostly spiders, carabid and staphylinid beetles); (ii) flying predators (coccinellid beetles, syrphid flies, gall midges, etc.) and parasitoids (aphidiid wasps), and a combination of (i) and (ii), compared with open controls. Aphid populations were 18% higher at reduced densities of ground-dwelling predators, 70% higher when flying predators and parasitoids were removed, and 172% higher on the removal of both enemy groups. Parasitoid wasps probably had the strongest effect, as flying predators occurred only in negligible densities. The great importance of parasitism is a new finding for aphid control in cereal fields. In conclusion, a more detailed knowledge of the mechanisms of natural pest control would help to develop environmentally sound crop management with reduced pesticide applications.

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Intraguild interference and biocontrol effects of generalist predators in a winter wheat field

Cited by 172 publications

References 45 publications

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

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

Functional diversity positively affects prey suppression by invertebrate predators: a meta‐analysis

Relative importance of predators and parasitoids for cereal aphid control

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