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Plant composition modulates arthropod pest and predator abundance: Evidence for culling exotics and planting natives

Parry, Hazel R. and Macfadyen, Sarina and Hopkinson, Jamie E. and Bianchi, Felix J. J. A. and Zalucki, Myron P. and Bourne, Anne and Schellhorn, Nancy A. (2015) Plant composition modulates arthropod pest and predator abundance: Evidence for culling exotics and planting natives. Basic and Applied Ecology .

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Article Link(s): http://dx.doi.org/10.1016/j.baae.2015.05.005

Publisher URL: http://www.sciencedirect.com/science/article/pii/S1439179115000833

Abstract

We investigate the role of plant species in crops, pasture and native vegetation remnants in supporting agronomic pests and their predators. The study was conducted in three Australian States and across 290 sites sampled monthly for two years. Pastures played a key role in harbouring pest species consistent across States, while native vegetation hosted relatively more predators than other habitat types within each State. Furthermore, native plant species supported the lowest pest density and more predators than pests; in contrast, 75 of the exotic weed species surveyed hosted more pests than predators. Despite the role of pasture in harbouring pests, we found in NSW that pasture also supported the highest proportion of juvenile predators, while native vegetation remnants had the lowest. Our results indicate that non-crop habitat (native remnants or pasture) with few exotic weeds supports high predator and low pest arthropod densities, and that weeds are associated with high pest densities. By linking broad response variables such as ‘all pests’ with specific predictors such as ‘plant species’, our study will inform on-farm management actions of which weeds to control and which natives to plant or regenerate. This study shows the importance of knowing the function of habitats and plants species in supporting pests and predators in agricultural landscapes across multiple regions.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Biological control Ecosystem services Habitat functionality Integrated pest management Pest suppressive landscapes Re-vegetation Sustainable farming
Subjects:Science > Invasive Species > Plants > Biological control
Plant pests and diseases > Weeds, parasitic plants etc
Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Deposited On:13 Aug 2015 05:49
Last Modified:12 Jun 2016 23:51

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