Efficacy of Neonicotinoid Seed Treatments to Reduce Soybean Aphid Populations Under Field and Controlled Conditions in Nebraska

Magalhães, Leonardo C.; Hunt, Thomas E.; Siegfried, Blair D.

doi:10.1603/029.102.0127

Cited by 112 publications

(95 citation statements)

References 38 publications

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“…Using methods similar to Magalhaes et al. (2009), V1 trifoliate leaves from V2 vegetative stage SD01‐76R plants were excised and immersed in insecticide or control solution for 24 h prior to infestation with experimental aphids. Overall, this design minimized variation between treatments within a pot ( Rag1 ) or container (thiamethoxam) and allowed for paired measurements of aphid performance under control and stress treatments.…”

Section: Methodsmentioning

confidence: 99%

Stress‐induced changes in abundance differ among obligate and facultative endosymbionts of the soybean aphid

Enders

Miller

2016

Ecology and Evolution

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Bacterial endosymbionts can drive evolutionary novelty by conferring adaptive benefits under adverse environmental conditions. Among aphid species there is growing evidence that symbionts influence tolerance to various forms of stress. However, the extent to which stress inflicted on the aphid host has cascading effects on symbiont community dynamics remains poorly understood. Here we simultaneously quantified the effect of host‐plant induced and xenobiotic stress on soybean aphid (Aphis glycines) fitness and relative abundance of its three bacterial symbionts. Exposure to soybean defensive stress (Rag1 gene) and a neurotoxic insecticide (thiamethoxam) substantially reduced aphid composite fitness (survival × reproduction) by 74 ± 10% and 92 ± 2%, respectively, which in turn induced distinctive changes in the endosymbiont microbiota. When challenged by host‐plant defenses a 1.4‐fold reduction in abundance of the obligate symbiont Buchnera was observed across four aphid clonal lines. Among facultative symbionts of Rag1‐stressed aphids, Wolbachia abundance increased twofold and Arsenophonus decreased 1.5‐fold. A similar pattern was observed under xenobiotic stress, with Buchnera and Arsenophonus titers decreasing (1.3‐fold) and Wolbachia increasing (1.5‐fold). Furthermore, variation in aphid virulence to Rag1 was positively correlated with changes in Arsenophonus titers, but not Wolbachia or Buchnera. A single Arsenophonus multi‐locus genotype was found among aphid clonal lines, indicating strain diversity is not primarily responsible for correlated host‐symbiont stress levels. Overall, our results demonstrate the nature of aphid symbioses can significantly affect the outcome of interactions under stress and suggests general changes in the microbiome can occur across multiple stress types.

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Section: Methodsmentioning

confidence: 99%

Stress‐induced changes in abundance differ among obligate and facultative endosymbionts of the soybean aphid

Enders

Miller

2016

Ecology and Evolution

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“…The treatments consisted of four concentrations of the insecticide and a control: 10, 5, 2.5, 1.25, 0 ng/ml with seven replications per treatment. This concentration range corresponds to those that aphids are likely to encounter in soybean fields and that allow survivorship of the aphids (Magalhaes et al 2009). Based on the consumption behavior of O. insidiosus reported by Rutledge and O'Neil (2005), a prey density of 20 aphids was placed in each experimental unit.…”

Section: Toxicity Of Thiamethoxam Residues In a Glycinesmentioning

confidence: 99%

“…To evaluate the toxicity of thiamethoxam in treated soybean leaves, a systemic bioassay was used following the methodology of Magalhaes et al (2009). The concentration range was 500, 100, 50, 10 and 5 ng/ml.…”

Section: Toxicity Of Thiamethoxam Residues In Soybean Vegetative Tissuementioning

confidence: 99%

“…These concentrations are likely to be present in soybean fields during early vegetative stages and exposure to soybean aphid is likely dependent on timing of migration. Generally, A. glycines arrives to soybean fields between June and July (Tilmon et al 2011) when concentrations in the plant are between 1 to 88 ng/g of vegetative tissue (Magalhaes et al 2009). Concentrations below 33.76 ng/g in vegetative tissue using the systemic bioassay are considered sublethal for soybean aphid (Magalhaes et al 2009).…”

Section: Effect Of Thiamethoxam Residues In a Glycinesmentioning

confidence: 99%

“…Generally, A. glycines arrives to soybean fields between June and July (Tilmon et al 2011) when concentrations in the plant are between 1 to 88 ng/g of vegetative tissue (Magalhaes et al 2009). Concentrations below 33.76 ng/g in vegetative tissue using the systemic bioassay are considered sublethal for soybean aphid (Magalhaes et al 2009). Consequently, there is a potential for continuous uptake of the insecticide by aphids exposed to thiamethoxam below these field concentrations.…”

Section: Effect Of Thiamethoxam Residues In a Glycinesmentioning

confidence: 99%

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Thiamethoxam Toxicity and Effects on Consumption Behavior in Orius insidiosus (Hemiptera: Anthocoridae) on Soybean

Camargo¹,

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Effectiveness of thiamethoxam and imidacloprid seed treatments against Bemisia tabaci (Hemiptera: Aleyrodidae) on cotton

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Zhang

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show abstract

Efficacy of Neonicotinoid Seed Treatments to Reduce Soybean Aphid Populations Under Field and Controlled Conditions in Nebraska

Cited by 112 publications

References 38 publications

Stress‐induced changes in abundance differ among obligate and facultative endosymbionts of the soybean aphid

Stress‐induced changes in abundance differ among obligate and facultative endosymbionts of the soybean aphid

Thiamethoxam Toxicity and Effects on Consumption Behavior in Orius insidiosus (Hemiptera: Anthocoridae) on Soybean

Effectiveness of thiamethoxam and imidacloprid seed treatments against Bemisia tabaci (Hemiptera: Aleyrodidae) on cotton

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