Genetic structure of two Plusiinae species suggests recent expansion of <i>Chrysodeixis includens</i> in the American continent

Perini, Clérison Régis; Sosa, Verónica I.; Koda, Vicente E.; Silva, Horacio; Risso, Andrés A.; Vasconcelos, Wanessa N. F.; Gonçalves, Carolina F.; Ugalde, Gustavo A.; Machado, Dayanna Nascimento; Bevilacqua, Caroline Borges; Ardisson-Araújo, Daniel Mendes Pereira; Maebe, Kevin; Smagghe, Guy; Valmorbida, Ivair; Guedes, Jerson Vanderlei Carús

doi:10.1111/afe.12427

Cited by 12 publications

(17 citation statements)

References 43 publications

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“…R. nu is more adapted to subtropical and temperate regions than to tropical regions and is favored by higher latitudes and altitudes 41 . However, this pest has been reported from southern (Rio Grande do Sul and Paraná) to central regions of Brazil (Distrito Federal) 75 , 82 – 84 .…”

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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“…The development of resistance of R. nu and C. aporema to MON 87701 × MON 89788 soybean may have also been influenced by the biological characteristics of these species and of the cropping systems in Brazil. Historically, R. nu has been a soybean pest in the southern part of South America (Rio Grande do Sul state in Brazil, Uruguay and Argentina) 24 , 26 , 45 . In a prior field survey in 2019 and 2020, R. nu occurred at a low level in Brazil 7 .…”

Section: Discussionmentioning

confidence: 99%

“…However, R. nu has increased in abundance in soybean areas at lower latitudes, which may indicate an adaptation of R. nu populations to warmer climate conditions before evolving resistance to MON 87701 × MON 89788 soybean. Low genetic distances between populations from different South American countries also suggest the absence of geographical isolation amongst these natural populations 45 . For C. aporema , the short lifecycle (12 days) allows the development of several generations per season, therefore increasing the selection pressure for resistance.…”

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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“…Historicamente, a presença de R. nu era limitada a estados do sul do Brasil e a Argentina (Perini et al 2021), e assim, a detecção em diversas regiões do Brasil sinaliza uma provável adaptação ambiental Tabela 1. Local com ataques de lagarta falsa-medideira em soja Bt, identificação da espécie coletada, e mortalidade em laboratório em folhas de soja não Bt e soja Bt.…”

Section: Scientific Noteunclassified

Primeiro registro de Rachiplusia nu (Guenée, 1852) (Lepidoptera: Noctuidae) sobrevivendo em soja Bt no Brasil

et al. 2021

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Loopers are important defoliators in several crop species. Among the loopers attacking non-Bt soybean cultivars, Chrysodeixis includens (Walker, [1858]) was the most common. The use of trangenic Bt soybean in appromately 70% of the soybean fields in Brazil led to a decrease in the loopers in these fields. However, technical field specialists and soybean producers recently observed Plusiinae larvae damaging transgenic Bt soybean, posing a risk over the Bt technology. Therefore, the aim of this study was to identify and confirm the catterpillar species feeding on transgenic Bt soybean fields in Brazil. Larvae and soybean leaf samples were collected in 12 soybean-producing locations from four Brazillian States. Soybean leaf samples were tested to confirm whether they were transgenic Bt. Larvae were reared in artificial diet and submitted to feeding trials on non-transgenic and transgenic Bt soybean leaves. The species identification was perfomed by amplicon sequencing of the cytochrome oxidase I (COI) gene of eight larvae per local. All 12 populations fed in the transgenic Bt soybean and the sequencing analysis of COI determined that they belong to Rachiplusia nu (Guenée, 1852) with 100% similarity to the COI sequences available in NCBI for this species. These results suggest that the R. nu species is not controlled by the genetic modification event present in the tested soybean variety and highlights the need for additional looper management control strategies, such as insecticide application, for controlling this insect pest in transgenic Bt soybean.

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Genetic structure of two Plusiinae species suggests recent expansion of Chrysodeixis includens in the American continent

Cited by 12 publications

References 43 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

Primeiro registro de Rachiplusia nu (Guenée, 1852) (Lepidoptera: Noctuidae) sobrevivendo em soja Bt no Brasil

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