Invertebrate community structure predicts natural pest control resilience to insecticide exposure

Greenop, Arran; Cook, S. M.; Wilby, Andrew; Pywell, R. F.; Woodcock, Ben A.

doi:10.1111/1365-2664.13752

Cited by 41 publications

(6 citation statements)

References 73 publications

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“…Finally, both parasitoids and predators responded negatively to herbicides, which may reflect direct lethal effects of their application, but also indirect effects mediated by reduced abundance of herbivorous hosts and prey, and reduced cover and habitat quality of the herbaceous layer. Overall, these results suggest that structural and management changes along the intensification gradient can have far-reaching negative effects on predators and parasitoids, potentially compromising the provision of natural biocontrol 95 , 96 .…”

Section: Discussionmentioning

confidence: 90%

Canopy arthropod declines along a gradient of olive farming intensification

Vasconcelos

Pina

Herrera

et al. 2022

Sci Rep

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Arthropod declines have been linked to agricultural intensification. However, information about the impacts of intensification is still limited for many crops, as is our understanding of the responses of different arthropod taxa and trophic groups, thus hindering the development of effective mitigation measures. We investigated the impacts of olive farming intensification on canopy-dwelling arthropods in the Mediterranean region. Intensification involves the increased use of agrochemicals, mechanisation and irrigation, but also structural changes from traditional orchards with low densities of large and old trees, to intensive and superintensive orchards with high to very high densities of smaller and younger trees, respectively. Canopy arthropods were vacuum-sampled at 53 sites representing the three orchard intensification levels, in spring, summer and autumn 2017. We evaluated how the arthropod community varied across intensification levels, and in response to orchard structure, management and landscape context. We found no changes in the diversity of arthropod taxa across intensification levels after correcting for sample coverage, but arthropod abundance declined markedly along the intensification gradient. Decreased abundance was associated with changes in orchard structure, lower herbaceous cover, and higher herbicide and insecticide use. The abundance of a specialized olive pest was lower in landscapes with higher woodland cover. The negative effects of intensification were stronger in spring and summer than in autumn, and parasitoids and predators were particularly affected. Overall, results suggest that retaining herbaceous cover, reducing agrochemical inputs and preserving natural woody elements in the landscape, may contribute to mitigate impacts of olive farming intensification on canopy arthropods, particularly on beneficial species.

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Section: Discussionmentioning

confidence: 90%

Canopy arthropod declines along a gradient of olive farming intensification

Vasconcelos

Pina

Herrera

et al. 2022

Sci Rep

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“…The slope of the PROBIT plot is an important in commercial use. Synthetic insecticides that do not degrade easily exert pressure on biological systems, whereas a product of natural origin is incorporated back into an ecosystem after completing its function (Greenop, Cook, Wilby, Pywell, & Woodcock, 2020).…”

Section: Discussionmentioning

confidence: 99%

Insecticidal activity of ethanolic plant extracts on Aedes aegypti larvae

Valverde¹,

Rodríguez²,

Vargas³

2023

Uniciencia

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[Objective] The objective of this study was to determine the larvicidal activity against A. aegypti of ethanolic extracts of plants commonly found in Costa Rica. [Methodology] Larvicidal activity of ethanolic extracts of plants was determined in this study using the WHO/VBC/81.807: WHO/VBC/81. from 1981. An analysis PROBID for dose response was conducted to determine LC50 of the most prominent extracts. [Results] A total of six extracts with the highest toxicity were chosen, with the stem extract of Ipomoea cairica having the lowest LC50 of 0.0341 mg/mL, followed by I. cairica leaf extract with an LC50 of 0.121 mg/mL. The larvicidal activity of ethanolic extracts of plants was determined in this study, with an emphasis on the larvicidal potential of I. cairica as an environmentally friendly alternative for the control of A. aegypti. [Conclusions] The larvicidal activity for ethanolic extracts of different plants, with an emphasis on the larvicidal potential of I. cairica as an environmentally friendly alternative for the control of A. aegypti.

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“…However, pesticide use cancelled out the negative effect of meadows on pests, as has been found in previous studies showing that the positive effect of SNH on pest predation was removed by pesticides (Gagic, Hulthen, et al, 2019). This is likely due to the well‐known negative effect of pesticides on the community of natural enemies (Greenop et al, 2020). We additionally considered field size as a farming practice in our framework as this depends on farming decisions.…”

Section: Discussionmentioning

confidence: 99%

Environmentally friendly landscape management improves oilseed rape yields by increasing pollinators and reducing pests

Perrot

Bretagnolle

Gaba

2022

Journal of Applied Ecology

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1. Pollination and pest control are two major ecological functions sustaining crop yield. In insect-pollinated crops, previous studies have revealed that an increase in resources and habitats in landscapes can increase pest control by natural enemies as well as insect pollination by pollinators. However, data have been lacking that simultaneously considers the effects of landscape on both pollinators and pests, and the direct and indirect effects on yields of farming practices interacting with landscape, bees and pests.2. This study aimed to fill this gap by focusing on oilseed rape (OSR), an insectpollinated crop of high economic value. We first quantified the effects of landscape and farming practices on both bee and pest abundance caught in OSR blooming season in 124 farmed fields over a 6-year study (~20 fields sampled per year), and then used structural equation modelling to assess the direct and indirect links between bees, pests, farming practices and landscape on yield.3. The results showed that landscape had a stronger effect on bee and pest abundance than agrochemical farming practices. Bees and pests decreased with the amount of OSR in the landscape surrounding the focal field, and showed contrasted effects with the amount of meadow and organic farming: positive for bees and negative for pests. Bee abundance also increased with the amount of sunflower in the landscape the preceding year, and decreased with increasing field size. 4. While agrochemicals surprisingly had barely any effect on bees and pests, their use improved OSR yield, although at a similar magnitude as bee and pest abundances.5. Synthesis and application. This study, conducted in commercial crop fields, underlines the important contribution of sustainable landscape management for enhancing OSR yield. Despite agrochemicals' ability to improve or maintain OSR yields, their unconditional use is unsustainable due to negative externalities.Therefore, alternative options such as those highlighted in our study-such as reducing field size, increasing the amount of organic farming in the landscape,

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Invertebrate community structure predicts natural pest control resilience to insecticide exposure

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 41 publications

References 73 publications

Canopy arthropod declines along a gradient of olive farming intensification

Canopy arthropod declines along a gradient of olive farming intensification

Insecticidal activity of ethanolic plant extracts on Aedes aegypti larvae

Environmentally friendly landscape management improves oilseed rape yields by increasing pollinators and reducing pests

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