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Institut Sophia Agrobiotech

UMR INRA - Univ. Nice Sophia Antipolis - Cnrs

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Pest Management Science

10 April 2018

2018 John Wiley & Sons, Inc.
© Pest Management Science
Nitrogen and water inputs to tomato plant do not trigger bottom‐up effects on a leafminer parasitoid through host and non‐host exposures

Abstract

BACKGROUND

Bottom‐up and top‐down forces are major components of biological control against pests in an agro‐ecosystem. Understanding the multi‐trophic interactions between plants and secondary consumers would help optimize pest control strategies. We manipulated nitrogen and/or water inputs to tomato plants (Solanum lycopersicum) to test whether these manipulations could trigger bottom‐up effects on the parasitoid Necremnus tutaevia host (Tuta absoluta) and/or non‐host (Bemisia tabaci) exposures, and compared the control efficacy of N. tutae on T. absoluta in the presence and absence of B. tabaci.

RESULTS

The results showed no cascading effects of plant nitrogen and/or water inputs on N. tutaevia either host or non‐host exposure. The bottom‐up force was mitigated by chewing or sap‐feeding insect consumers at the second energy level. By contrast, the top‐down force on T. absoluta from parasitoids was enhanced by an additionally provided non‐host, which could produce alternative food sources extending N. tutae longevity and enhancing the fitness of its offspring.

CONCLUSION

Our results provided evidence for the combination of bottom‐up and top‐down approaches in tomato integrated pest management programs. © 2017 Society of Chemical Industry

Keywords

integrated pest management, biological, control plant–herbivore interactions, host‐feeding, Necremnus tutae, Tuta absoluta

Dong Yong‐Cheng, Han Peng, Niu Chang‐Ying, Zappalà Lucia, Amiens‐Desneux Edwige, Bearez Philippe, Lavoir Anne‐Violette, Biondi Antonio, and Desneux Nicolas (2017). Nitrogen and water inputs to tomato plant do not trigger bottom‐up effects on a leafminer parasitoid through host and non‐host exposures. Pest Management Science 74, 516–522. DOI: 10.1002/ps.4750

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