Toxicidad de la proteína Bt en Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) alimentadas con  estigmas de maíz en Paraguay

Gamarra, Magin; Gómez, Víctor A.; Arias, Osmar René; Gaona, Edgar F.; López, María Bernarda Ramírez de

doi:10.25100/socolen.v48i1.11215

“…The transgenic bt corn events have effects on the biology and development of the studied pest; However, it denotes a dilution of control efficacy compared to the more recently planted events such as MIR162 TM that contains the Vip3A19 protein, and a selection pressure for resistant individuals cannot be ruled out. Researchers (Cassio, 2002;Bernardi et al, 2016;Gamarra et al, 2022) mention similar effects in studies carried out. The effect of antibiosis will undoubtedly affect the population dynamics of S. frugiperda under field conditions, according to the material or event used in sowing; However, it is not the objective of transgenic materials, which rather seek varietal resistance to this pest.…”

Section: Discussionmentioning

confidence: 85%

“…In Puerto Rico, Brazil and the southern United States, resistance of S. frugiperda to Bt corn with the Cry1F or Cry1Ab proteins was detected (Storer et al, 2010;Farias et al, 2014;Huang et al, 2014;Omoto et al, 2016). At the level of Paraguay, Gómez et al (2017) and Gamarra et al (2022) report differences in susceptibility of S. frugiperda fed with bt corn released in Paraguay. More recent work in China at the laboratory level (Wang et al, 2022) mentions that there is variability in the susceptibility ranges of different populations of S. frugiperda to Bt corn events.…”

Section: Introductionmentioning

confidence: 99%

“…,Bernardi et al (2016),Gamarra et al (2022), andWang et al (2022) mention differences in susceptibility in the control of S. frugiperda due to the differentiated expression of proteins present in the events. In this research, the difference in mortality can also be explained by the type of protein that the hybrids express; Bt corn, event MIR162 TM , containing the most recently released and planted Vip3A19 protein, was the one that presented total larval mortality; This is also verified in studies conducted byAdamczyk and Mahaffey (2008),Sena et al (2009),Figueiredo et al (2013), and Santos-Amaya et al (2015) who observed similar results in sensitivity studies of S. frugiperda to the Vip3A19 protein (MIR162 TM ) versus the Cry1A and Cry1F proteins.…”

mentioning

confidence: 99%

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Toxicity of Bt Protein on Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) Fed With Corn Leaves in Paraguay

Silva,

Gómez,

Arias

et al. 2024

JAS

0

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The fall armyworm Spodoptera frugiperda is the most destructive pest in corn cultivation in Paraguay with yield losses of 20 to 70%. The adoption of genetically modified crops (GMO) is a valid technique for managing this pest. The objective of this investigation was to evaluate the toxicity among Bt events used locally; determining mortality and important biological parameters. The S. frugiperda population previously collected from the field was raised under laboratory conditions fed with leaves from events MIR162TM (Vip3A19), VT3ProTM (Cry1A105, Cry2Ab2, Cry3Bb), PowerCoreTM (Cry1A105, Cry1F, Cry2Ab2) and a treatment with non-maize. Bt BR106TM. The mortality of 120 larvae was evaluated for each treatment and the viability until the adult stage of those larvae that managed to survive the different treatments was observed. A high toxicity effect was verified with 100% mortality of neonatal larvae fed with the MIR162TM (Vip3A19) event; as for the other events, 86% and 61% VT3ProTM (Cry1A105, Cry2Ab2, Cry3Bb), and PowerCoreTM (Cry1A105, Cry1F, Cry2Ab2) respectively; with 13% mortality for the non-Bt control variety BR106TM. The oviposition period, viability and number of eggs laid in adults surviving the PowerCoreTM (Cry1A105, Cry1F, Cry2Ab2) and VT3ProTM (Cry1A105, Cry2Ab2, Cry3Bb) events were reduced, affecting the fecundity of the surviving insect population.

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“…In Puerto Rico, Brazil and the southern United States, resistance of S. frugiperda to Bt corn with the Cry1F or Cry1Ab proteins was detected (Storer et al, 2010;Farias et al, 2014;Huang et al, 2014;Omoto et al, 2016). At the level of Paraguay, Gómez et al (2017) and Gamarra et al (2022) report differences in susceptibility of S. frugiperda fed with bt corn released in Paraguay. More recent work in China at the laboratory level (Wang et al, 2022) mentions that there is variability in the susceptibility ranges of different populations of S. frugiperda to Bt corn events.…”

Section: Introductionmentioning

confidence: 99%

Toxicity of Bt Protein on Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) Fed With Corn Leaves in Paraguay

Silva,

Gómez,

Arias

et al. 2024

JAS

0

View full text Add to dashboard Cite

The fall armyworm Spodoptera frugiperda is the most destructive pest in corn cultivation in Paraguay with yield losses of 20 to 70%. The adoption of genetically modified crops (GMO) is a valid technique for managing this pest. The objective of this investigation was to evaluate the toxicity among Bt events used locally; determining mortality and important biological parameters. The S. frugiperda population previously collected from the field was raised under laboratory conditions fed with leaves from events MIR162TM (Vip3A19), VT3ProTM (Cry1A105, Cry2Ab2, Cry3Bb), PowerCoreTM (Cry1A105, Cry1F, Cry2Ab2) and a treatment with non-maize. Bt BR106TM. The mortality of 120 larvae was evaluated for each treatment and the viability until the adult stage of those larvae that managed to survive the different treatments was observed. A high toxicity effect was verified with 100% mortality of neonatal larvae fed with the MIR162TM (Vip3A19) event; as for the other events, 86% and 61% VT3ProTM (Cry1A105, Cry2Ab2, Cry3Bb), and PowerCoreTM (Cry1A105, Cry1F, Cry2Ab2) respectively; with 13% mortality for the non-Bt control variety BR106TM. The oviposition period, viability and number of eggs laid in adults surviving the PowerCoreTM (Cry1A105, Cry1F, Cry2Ab2) and VT3ProTM (Cry1A105, Cry2Ab2, Cry3Bb) events were reduced, affecting the fecundity of the surviving insect population.

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“…En el adulto macho, el ala anterior generalmente sombreada de color gris y marrón, con manchas blancas en la punta triangular y cerca del centro del ala. Las alas delanteras de las hembras son menos marcadas, que van desde un color marrón grisáceo uniforme a un moteado de gris y marrón. El ala posterior es de color blanco plateado con un borde estrecho y oscuro iridiscente en ambos sexos (Gamarra, 2022).…”

Section: Introduccionunclassified

Resistência de Spodoptera frugiperda Smith aos inseticidas abamectina, alfacipermetrina, tiodicarbe e bifentrina

Chacha,

Loja,

Vivas

et al. 2023

Braz. J. Anim. Environ. Res.

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O objetivo deste trabalho de pesquisa foi determinar a linha básica de resistência de Spodoptera frugiperda (Smith) aos inseticidas alfacipermetrina, tiodicarbe, bifetrina e abamectina, por meio de bioensaios de suscetibilidade e da seleção de populações de larvas de terceiro instar. A pesquisa foi realizada no Laboratório de Entomologia da Faculdade de Ciências Agrícolas da Universidade Técnica de Babahoyo, localizada no km 7,5 da estrada Babahoyo-Montalvo. Foram usados quatro inseticidas de diferentes grupos químicos. Os produtos foram aplicados no protórax das larvas em soluções estoque e dosagens para cada inseticida, com um tempo máximo de avaliação de 96 horas. Foram usadas oito concentrações para cada insumo, variando de 0,0 a 7 ug/larva, respectivamente. A resposta do grupo de larvas (controle) foi medida apenas com alimentação. A seleção do material biológico foi feita durante uma única geração de larvas. Concluiu-se que, para o inseticida tiodicar, a DL50 foi de 2,00067; para o inseticida alfacipermetrina, a DL50 obtida foi de 0,320884; para o inseticida abamectina, a DL50 foi de 1,70342 e para o inseticida bifentrina, a DL50 foi de 0,864843. Todas as populações usadas em todos os grupos químicos testados tiveram 100% de mortalidade com as concentrações mais altas no controle 24 horas após a aplicação, enquanto as colônias selecionadas com as concentrações mais baixas não excederam 16% de mortalidade. O controle teve uma média de 2,32% de mortalidade no mesmo período. A DL50 variou de 2,3 vezes a dose comercial. Os altos níveis de controle indicam que as larvas do inseto não possuem mecanismos de resistência a esses grupos de inseticidas no momento, por isso devem ser implementadas estratégias de manejo de resistência em S. frugiperda.

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Toxicidad de la proteína Bt en Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) alimentadas con estigmas de maíz en Paraguay

Cited by 4 publications

References 15 publications

Toxicity of Bt Protein on Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) Fed With Corn Leaves in Paraguay

Toxicity of Bt Protein on Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) Fed With Corn Leaves in Paraguay

Toxicity of Bt Protein on Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) Fed With Corn Leaves in Paraguay

Resistência de Spodoptera frugiperda Smith aos inseticidas abamectina, alfacipermetrina, tiodicarbe e bifentrina

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