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At Which Spatial Scale Does Crop Diversity Enhance Natural Enemy Populations and Pest Control? An Experiment in a Mosaic Cropping System

文献类型： 外文期刊

作者： Jaworski, Coline C. 1 ; Thomine, Eva 1 ; Rusch, Adrien 4 ; Lavoir, Anne-Violette 1 ; Xiu, Chunli 5 ; Ning, Di 3 ; Lu, Yanhui 5 ; Wang, Su 3 ; Desneux, Nicolas 1 ;

作者机构： 1.Univ Cote dAzur, UMR ISA, CNRS, INRAE, F-06000 Nice, France

2.Univ Cambridge, Dept Zool, Cambridge CB2 3EJ, England

3.Beijing Acad Agr & Forestry, Inst Plant & Environm Protect, Beijing 100097, Peoples R China

4.Univ Bordeaux, Bordeaux Sci Agro, ISVV, INRAE,UMR SAVE, F-33140 Villenave Dornon, France

5.Chinese Acad Agr Sci, Inst Plant Protect, Beijing 100193, Peoples R China

关键词： aphid; ladybirds; spillover; crop succession; arthropod movement; dispersal; landscape complexity

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 8 期

页码：

收录情况： SCI

摘要： The importance of plant richness to enhance the presence, biodiversity and efficiency of natural enemies in agricultural systems has largely been studied and demonstrated these last decades. Planting and preserving non-crop plants or manipulating crop richness in fields are practices that have proven their efficiency. However, the impact of crop-richness continuity in space and time on pests and natural enemies at a landscape scale remains poorly studied. In a two-year study, we assessed the effect of crop richness (single crop vs. multiple crops) on pest and natural enemy abundance and spillover in a field experiment in north-east China. Overall, we found crop diversity had a limited impact on pest and natural enemy abundance at the spatial scale tested (0.025 vs. 0.2 ha). The total pest and natural enemy abundances were not different between single-crop and multi-crop plots in either year, and the community composition at the functional group level was mostly determined by the crop but not crop diversity. However, we found that crop diversity influenced the numeric response of ladybirds to aphids in wheat; their negative response (higher abundance where aphid abundance was lower, suggesting predation) was attenuated in multi-crop plots (no correlation of aphid and ladybird abundance, suggesting the use of alternative resources). This pattern was not found in maize. Finally, crop succession enhanced the spillover of ladybirds from wheat and maize to cotton plots but with limited benefits for aphid control. Because of these limited impacts, we hypothesized that crop diversity may benefit natural enemy populations and enhance pest control at larger spatial scales; while we found similar abundances of ladybirds between our small (0.025-0.2 ha) plots and in large (2 ha) close-by cotton fields, aphid abundances were more than ten times higher in large cotton fields. Our study highlights the need to accurately estimate the spatial scale at which crop biodiversity may benefit pest control, in relation to the ecology of the target pest and natural enemies.

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