Influence of plant fertilisation on cereal aphid-primary parasitoid-secondary parasitoid networks in simple and complex landscapes

Vollhardt, Ines M. G.; Ye, Zhengpei; Parth, Nadia; Rubbmark, Oskar Rennstam; Fründ, Jochen; Traugott, Michael

doi:10.1016/j.agee.2019.04.030

Cited by 6 publications

(10 citation statements)

References 47 publications

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“…Similar findings were observed in a walnut aphid-Aphidiinae parasitoid system 24 . Mixed results were reported in previous studies 5 , 11 . The densities of cereal aphids and parasitoids increased when input of nitrogen fertilizer increased from 115 to 170 kg N ha −1 , while the parasitism rate increased steadily 5 .…”

Section: Discussioncontrasting

confidence: 58%

“…Consequently, the parasitism rare was underestimated and the annual fluctuations of abundance of the parasitoids and the parasitism rate were magnified, especially early in the season. Molecular detection, which has the capacity to evaluate whether symptomless aphids have been parasitized and if so by which parasitoid species, presents an exceedingly promising alternative for exploring the aphid-parasitoid interaction 11 , 33 . This burgeoning method should be employed to more accurately evaluate the aphids-parasitoids interaction.…”

Section: Discussionmentioning

confidence: 99%

“…For example, both population of cereal aphids ( S. avenae and R. padi ) are positively responsive to nitrogen levels in the range of 115–170 kg N ha −1 in northern China 5 . In contrast, nitrogen fertilizer has a negative influence on the density of cereal aphid ( S. avenae ) in Germany 11 . Considering that the levels of nitrogen input in different research studies are varied, it is reasonable to assume that adequate coverage of nitrogen levels accounts for the observed variation.…”

Section: Introductionmentioning

confidence: 96%

“…The effects of nitrogen fertilizer on biocontrol by Aphidiinae parasitoids on cereal aphids are varied 5 , 10 , 17 . For example, the parasitism rate in plots exposed to fertilizer is lower compared with that in fertilizer-free plots in Germany 11 , while the parasitism rate increased with nitrogen input in northern China 5 . A manipulation study in the laboratory showed that parasitism rate remained unaffected by nitrogen level 18 .…”

Section: Introductionmentioning

confidence: 97%

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Moderately decreasing fertilizer in fields does not reduce populations of cereal aphids but maximizes fitness of parasitoids

Qiao

Yang

Hou

et al. 2021

Sci Rep

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Examination of the tradeoff between the extent of decreasing nitrogen input and pest suppression is crucial for maintaining the balance between essential yield and an efficient, sustainable pest control strategy. In this study, an experiment with four manipulated nitrogen fertilizer levels (70, 140, 210, and 280 kg N ha−1 = conventional level) was conducted to explore the effects of decreasing nitrogen on cereal aphids (Sitobion avenae and Rhopalosiphum padi) (Hemiptera: Aphididae), Aphidiinae parasitoids (Hymenoptera: Braconidae: Aphidiinae), and body sizes of parasitoids. The results indicated that nitrogen application, in the range of 70–280 kg N ha−1, has the potential to impact the populations of cereal aphids and their parasitoids. However, both differences between densities of cereal aphids and their parasitoids in moderate (140–210 kg N ha−1) and those in high nitrogen input (280 kg N ha−1) were not significant, and the parasitism rate was also unaffected. A higher parasitism rate reduced population growth of the cereal aphid (S. avenae). Additionally, a moderate decrease of nitrogen fertilizer from 280 to 140–210 kg N ha−1 maximized the body sizes of Aphidiinae parasitoids, indicating that a moderate decrease of nitrogen fertilizer could facilitate biocontrol of cereal aphid by parasitoids in the near future. We conclude that a moderate decrease in nitrogen application, from 280 to 140–210 kg N ha−1, does not quantitatively impact the densities of cereal aphids or the parasitism rate but can qualitatively maximize the fitness of the parasitoids.

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Section: Discussioncontrasting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Moderately decreasing fertilizer in fields does not reduce populations of cereal aphids but maximizes fitness of parasitoids

Qiao

Yang

Hou

et al. 2021

Sci Rep

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“…On-farm management and landscape context determine aphid colonization rates and the action of EDS providers, e.g., hyperparasitoids 49 . The aphid-parasitoid network structure is equally influenced by landscape complexity and management practices such as pesticide or fertilizer applications 50 .…”

Section: Introductionmentioning

confidence: 99%

Species diversity and food web structure jointly shape natural biological control in agricultural landscapes

Yang

Liu

et al. 2021

Commun Biol

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Land-use change and agricultural intensification concurrently impact natural enemy (e.g., parasitoid) communities and their associated ecosystem services (ESs), i.e., biological pest control. However, the extent to which (on-farm) parasitoid diversity and food webs mediate landscape-level influences on biological control remains poorly understood. Here, drawing upon a 3-year study of quantitative parasitoid-hyperparasitoid trophic networks from 25 different agro-landscapes, we assess the cascading effects of landscape composition, species diversity and trophic network structure on ecosystem functionality (i.e., parasitism, hyperparasitism). Path analysis further reveals cascaded effects leading to biological control of a resident crop pest, i.e., Aphis gossypii. Functionality is dictated by (hyper)parasitoid diversity, with its effects modulated by food web generality and vulnerability. Non-crop habitat cover directly benefits biological control, whereas secondary crop cover indirectly lowers hyperparasitism. Our work underscores a need to simultaneously account for on-farm biodiversity and trophic interactions when investigating ESs within dynamic agro-landscapes.

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Effects of landscape structure on abundance and family richness of hymenopteran parasitoids in the olive agroecosystem

Pascual¹,

Rescia

Ondul³

et al. 2022

Agriculture, Ecosystems & Environment

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Influence of plant fertilisation on cereal aphid-primary parasitoid-secondary parasitoid networks in simple and complex landscapes

Cited by 6 publications

References 47 publications

Moderately decreasing fertilizer in fields does not reduce populations of cereal aphids but maximizes fitness of parasitoids

Moderately decreasing fertilizer in fields does not reduce populations of cereal aphids but maximizes fitness of parasitoids

Species diversity and food web structure jointly shape natural biological control in agricultural landscapes

Effects of landscape structure on abundance and family richness of hymenopteran parasitoids in the olive agroecosystem

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