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Flower provision reduces intraguild predation between predators and increases aphid biocontrol in tomato

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Abstract

Intraguild predation (IGP)–the predation of a natural enemy species upon another one sharing a prey species–is relatively frequent in both natural and agroecosystems. This may reduce pest control and the establishment of predator populations during mass release of biological control agents or in multi-predator systems due to increased mortality of predators. IGP is exacerbated in isolated and space-limited systems such as greenhouses, due to reduced food resources and movement. Therefore, adding food resources as an alternative to the main prey, such as floral resources, could reduce IGP between natural enemies in these systems. In the present study we investigated the role of supplemental floral resources to help reduce intra- and interspecific IGP involving Harmonia axyridis and Propylea japonica (Coleoptera: Coccinellidae) in laboratory conditions, and we tested its application in a greenhouse setup. We found a significant reduction in intra- and interspecific IGP in laboratory conditions when floral resources were abundant. At a greenhouse scale, abundances of both ladybird species increased when floral resources were abundant, potentially through a combination of enhanced fertility and reduced IGP. This resulted in reduced abundances of aphid pest populations on tomato crops. Our study demonstrates that companion plants in greenhouses can improve pest control in systems with multi-species biological control agent releases.

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Acknowledgements

The study was funded by the project 32072479 supported by the National Natural Science Foundation of China, the National Key Research and Development Program of China (2017YFD0201000; 2017YFD0200400), the Beijing Key Laboratory of Environment Friendly Management on Fruit Diseases and Pests in North China (BZ0432) and the Key Research and Development Program of Jiangxi Province (20202BBF62006).

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  1. Yuyong Liang and Xu Chen equally contributed to this study.

Authors and Affiliations

  1. Institute of Plant Protection, Jiangxi Academy of Agricultural Sciences, Nanchang, Jiangxi, China

    Yuyong Liang

  2. Beijing Academy of Agricultural and Forestry Sciences, Beijing, China

    Xu Chen, Jie Wang, Xiaojun Guo, Su Wang & Coline C. Jaworski

  3. Key Laboratory of Green Pesticide & Agricultural Engineering Ministry of Education, Guizhou University, Guiyang, Guizhou, China

    Xu Chen

  4. Weifang University of Science and Technology, Weifang, Shandong, China

    Huijie Dai

  5. Department of Zoology, University of Oxford, Oxford, OX1 3PS, UK

    Coline C. Jaworski

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  1. Yuyong Liang
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SW, CCJ, YL and XG designed the study; CX and JW performed the experiments; CX, HDJ and CCJ analyzed the data; YL, CX, CCJ and SW wrote the manuscript. All authors read and approved the manuscript for submission.

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Correspondence to Xiaojun Guo or Su Wang.

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Authors declare they have no competing interests. SW is a Subject Editor of Journal of Pest Science and was not involved in the journal’s review of, or decision related to, this manuscript.

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Liang, Y., Chen, X., Dai, H. et al. Flower provision reduces intraguild predation between predators and increases aphid biocontrol in tomato. J Pest Sci 95, 461–472 (2022). https://doi.org/10.1007/s10340-021-01396-x

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