Performance of Genetically Modified Soybean Expressing the Cry1A.105, Cry2Ab2, and Cry1Ac Proteins Against Key Lepidopteran Pests in Brazil

Bacalhau, Fabiana Britti; Dourado, Patrick M.; Horikoshi, Renato J.; Carvalho, Rumão Batista Nunes de; Semeão, Altair Arlindo; Martinelli, Samuel; Berger, G.; Head, Graham P.; Salvadori, J. R.; Bernardi, Oderlei

doi:10.1093/jee/toaa236

Cited by 24 publications

(11 citation statements)

References 28 publications

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“…7 ). The challenge posed by secondary pests such as Spodoptera species highlights the need to develop Bt soybean technologies with novel modes of action 59 , 85 , 86 . When available, Bt soybean technologies with diverse modes of action will enhance pest management systems for soybean in Brazil.…”

Section: Discussionmentioning

confidence: 99%

Large-scale assessment of lepidopteran soybean pests and efficacy of Cry1Ac soybean in Brazil

Horikoshi

Dourado²,

Berger³

et al. 2021

Sci Rep

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The soybean technology MON 87701 × MON 89788, expressing Cry1Ac and conferring tolerance to glyphosate, has been widely adopted in Brazil since 2013. However, pest shifts or resistance evolution could reduce the benefits of this technology. To assess Cry1Ac soybean performance and understand the composition of lepidopteran pest species attacking soybeans, we implemented large-scale sampling of larvae on commercial soybean fields during the 2019 and 2020 crop seasons to compare with data collected prior to the introduction of Cry1Ac soybeans. Chrysodeixis includens was the main lepidopteran pest in non-Bt fields. More than 98% of larvae found in Cry1Ac soybean were Spodoptera spp., although the numbers of Spodoptera were similar between Cry1Ac soybean and non-Bt fields. Cry1Ac soybean provided a high level of protection against Anticarsia gemmatalis, C. includens, Chloridea virescens and Helicoverpa spp. Significant reductions in insecticide sprays for lepidopteran control in soybean were observed from 2012 to 2019. Our study showed that C. includens and A. gemmatalis continue to be primary lepidopteran pests of soybean in Brazil and that Cry1Ac soybean continues to effectively manage the target lepidopteran pests. However, there was an increase in the relative abundance of non-target Spodoptera spp. larvae in both non-Bt and Cry1Ac soybeans.

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Section: Discussionmentioning

confidence: 99%

Large-scale assessment of lepidopteran soybean pests and efficacy of Cry1Ac soybean in Brazil

Horikoshi

Dourado²,

Berger³

et al. 2021

Sci Rep

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“…To maintain the benefits of MON 87701 × MON 89788 soybean against primary target pests such as C. includens and A. gemmatalis , it is important to follow the refuge recommendation. The next generation of Bt soybean will continue to use Cry1Ac protein, now pyramided with Cry1A.105 and Cry2Ab2 51 . Therefore, the implementation of resistance management strategies is essential for the sustainability of both current and new Bt soybean varieties for managing lepidopteran pests in South America.…”

Section: Discussionmentioning

confidence: 99%

Resistance status of lepidopteran soybean pests following large-scale use of MON 87701 × MON 89788 soybean in Brazil

Horikoshi¹,

Bernardi

Godoy

et al. 2021

Sci Rep

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Widespread adoption of MON 87701 × MON 89788 soybean, expressing Cry1Ac Bt protein and glyphosate tolerance, has been observed in Brazil. A proactive program was implemented to phenotypically and genotypically monitor Cry1Ac resistance in Chrysodeixis includens (Walker). Recent cases of unexpected injury in MON 87701 × MON 89788 soybean were investigated and a large-scale sampling of larvae on commercial soybean fields was performed to assess the efficacy of this technology and the distribution of lepidopteran pests in Brazil. No significant shift in C. includens susceptibility to Cry1Ac was observed eight years after commercial introduction of this technology in Brazil. F2 screen results confirmed that the frequency of Cry1Ac resistance alleles remains low and stable in C. includens. Unexpected injury caused by Rachiplusia nu (Guenée) and Crocidosema aporema (Walsingham) in MON 87701 × MON 89788 soybean was detected during the 2020/21 season, and studies confirmed a genetically based alteration in their susceptibility to Cry1Ac. MON 87701 × MON 89788 soybean remains effective against Anticarsia gemmatalis (Hübner), C. includens, Chloridea virescents (Fabricius) and Helicoverpa armigera (Hübner) in Brazil. However, there is evidence of field-evolved resistance to MON 87701 × MON 89788 soybean by the secondary soybean pests R. nu and C. aporema.

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“…The Bt soybean has been effective in controlling A. gemmatalis [30][31][32] ; however, this technology is not available in all soybean producing regions. Therefore, this pest has a capacity to cause serious loss in conventional soybean systems, and under conditions of high infestation, foliar consumption can be total 33 .…”

Section: Introductionmentioning

confidence: 99%

Larval movement of Anticarsia gemmatalis (Lepidoptera: Erebidae) on vegetative and reproductive stage non-Bt soybean

Ongaratto

Baldin

Hunt

et al. 2022

Preprint

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Integrated pest management (IPM) and insect resistance management (IRM) in a cropping system demands a comprehensive understanding of insect behavior, including larval movement. We evaluated the larval movement of velvetbean caterpillar, Anticarsia gemmatalis (Hübner), in a non-Bt soybean cultivar. Third to fifth instars were infested in different combinations in vegetative and reproductive soybean stages, and on-plant movement was characterized across select time points. The dispersion among plants in different positions and orientations was assessed by releasing 24-h-old larvae on the central plant of field plots. Results indicated that A. gemmatalis larvae are consistent in their movement during the day, regardless of plant section or leaf position. Over the time period of assessment, larvae gradually moved down and left the plant. Although there was not significant difference in the distance traveled by A. gemmatalis between orientations and positions, long distances were covered indicating that this species has nondirectional movement. This study provides relevant information regarding the movement of the velvetbean caterpillar, which can be used to improve insecticide spraying efficacy, improve probabilistic model predictive ability, and help design insect resistance management strategies.

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Performance of Genetically Modified Soybean Expressing the Cry1A.105, Cry2Ab2, and Cry1Ac Proteins Against Key Lepidopteran Pests in Brazil

Cited by 24 publications

References 28 publications

Large-scale assessment of lepidopteran soybean pests and efficacy of Cry1Ac soybean in Brazil

Large-scale assessment of lepidopteran soybean pests and efficacy of Cry1Ac soybean in Brazil

Resistance status of lepidopteran soybean pests following large-scale use of MON 87701 × MON 89788 soybean in Brazil

Larval movement of Anticarsia gemmatalis (Lepidoptera: Erebidae) on vegetative and reproductive stage non-Bt soybean

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