Diel variation in the abundance and composition of the predator assemblages feeding on aphid-infested soybean

Petersen, Luke F.; Woltz, J. Megan

doi:10.1007/s10526-014-9631-6

Cited by 7 publications

(3 citation statements)

References 39 publications

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“…There is also some evidence that carabids and aphids control by their natural enemies in cereal crops benefit from the proportion of organic farming in surrounding landscape (Caro et al, 2016;Diekötter et al, 2016;Djoudi et al, 2018;Muneret et al, 2019) which may explain why aphid predation rates increased with amount of fields under organic farming. A camera-trap experiment may help to identify the natural enemies responsible for aphid and seed predation (Petersen and Woltz, 2015); especially because the ground position of aphid cards in our study may have excluded predation from aerial predators such as birds or ladybirds. Including such predators might change the spatial extent of the landscape effects detected in our study.…”

Section: Discussionmentioning

confidence: 99%

Proportion of Grassland at Landscape Scale Drives Natural Pest Control Services in Agricultural Landscapes

et al. 2021

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Managing regulating ecosystem services delivered by biodiversity in farmland is a way to maintain crop yields while reducing the use of agrochemicals. Because semi-natural habitats provide shelter and food for pest enemies, a higher proportion of semi-natural habitats in the landscape or their proximity to crops may enhance pest control in arable fields. However, the ways in which the spatial arrangement of these habitats affects the delivery of this beneficial ecosystem service to crops remains poorly known. Here, we investigated the relative effects of the amount of grassland in the landscape versus the distance to the nearest grassland on the predation rates of weed seeds and aphids into 52 cereal fields. We found that both seed and aphid predation levels increased with the proportion of grassland in a 500 m radius buffer while the distance to the nearest grassland displayed no effect. We show that increasing from 0 to 50% the proportion of grasslands in a 500 m radius, respectively, increased seed and aphid predation by 38 and 20%. In addition to the strong effect of the proportion of grassland, we found that seed predation increased with the proportion of forest fragments while aphid predation increased with the proportion of organic farming in the landscape. Overall, our results reveal that natural pest control in cereal crops is not related to the distance to the nearest grassland, suggesting that natural enemies are not limited by their dispersal ability. Our study indicates that maintaining key semi-natural habitats, such as grasslands, is needed to ensure natural pest control and support food production in agricultural landscapes.

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Section: Discussionmentioning

confidence: 99%

Proportion of Grassland at Landscape Scale Drives Natural Pest Control Services in Agricultural Landscapes

et al. 2021

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“…The impact of each predator species within the assemblage on soybean aphid remains 105 unclear, as most previous studies used predator exclusion cages 106 Desneux et al, 2006;Gardiner et al, 2009a), rely solely on correlations (e.g. Maisonhaute et al, 2017;Yoo and O'Neil, 2009), or used short term assessments of predation Harwood et al, 2009;Petersen and Woltz, 2015;Woltz and Landis, 2013).…”

Section: Generalist Insect Predators Represent An Important Componentmentioning

confidence: 99%

Predators and alate immigration influence the season-long dynamics of soybean aphid (Hemiptera: Aphididae)

2018

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The identification of key species within multi-predator assemblages suppressing agricultural pests is paramount to the incorporation of predators into pest management plans. Generalist predators have strong impacts on population growth of soybean aphids (Aphis glycines, Hemiptera: Aphidae) in North America, but their relative influence may vary seasonally, and potentially interact with immigration of alate aphids following initial field colonization. Here we present the results of a season-long study in Minnesota that used cage manipulations to estimate weekly impacts of predation on field populations of soybean aphids, while concurrently quantifying alate aphid and predator densities. We used generalized linear models based on field level aphid and predator counts, and aphid counts on caged and uncaged experimental plants, to show that Harmonia axyridis (Coleoptera: Coccinellidae) was negatively associated with A. glycines abundance, even under alate immigration levels associated with aphid outbreaks, suggesting potential regulation of aphid populations. In contrast, two other common predators, Coccinella septempunctata (Coleoptera: Coccinellidae) and Orius insidiosus (Hemiptera: Anthocoridae), did not show patterns of association with aphid dynamics. We also show that A. glycines populations only have significant positive associations with the number of immigrating alatae on uncaged experimental plants that had higher alate densities than the field average. The negative effect of H. axyridis on aphid populations was also observed on uncaged experimental plants, suggesting that even high levels of alate aphid immigration did not disrupt predator suppression. These results add to the growing body of evidence demonstrating that even low numbers of certain generalist predators can effectively suppress pest populations in agroecosystems. In particular, our findings suggest that the abundance of both H. axyridis and alate aphids are critical to soybean aphid seasonal dynamics.

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“…These communities may not respond in the same way to management. There is a scientific evidence that arthropods communities differ between day and night (Petersen and Woltz, 2015). Importantly, the survival time was negatively correlated to vegetation cover indicating that predation events occurred faster in fully vegetated vineyards.…”

Section: Effects Of Inter-row Vegetation Management On Predationmentioning

confidence: 99%

The key role of inter-row vegetation and ants on predation in Mediterranean organic vineyards

Blaise

Mazzia

Bischoff

et al. 2021

Agriculture, Ecosystems & Environment

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Diel variation in the abundance and composition of the predator assemblages feeding on aphid-infested soybean

Cited by 7 publications

References 39 publications

Proportion of Grassland at Landscape Scale Drives Natural Pest Control Services in Agricultural Landscapes

Proportion of Grassland at Landscape Scale Drives Natural Pest Control Services in Agricultural Landscapes

Predators and alate immigration influence the season-long dynamics of soybean aphid (Hemiptera: Aphididae)

The key role of inter-row vegetation and ants on predation in Mediterranean organic vineyards

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