Strain composition and genetic diversity of the fall armyworm Spodoptera frugiperda (Lepidoptera, Noctuidae): new insights from seven countries in West Africa

Sarr, Oumar Mal; Garba, Madougou; Bal, Amadou Bocar; Hima, Karmadine; Ndiaye, Mbaye; Fossoud, Amandine; Clamens, Anne‐Laure; Tavoillot, Johannes; Gauthier, Nathalie

doi:10.1007/s42690-021-00450-6

Cited by 8 publications

(3 citation statements)

References 48 publications

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“…U72977) and CS (Accession No. U72974) in previous studies (Maruthadurai and Ramesh, 2020;Nelly et al, 2021;Sarr et al, 2021).…”

Section: Dna Sequence Analysismentioning

confidence: 85%

PCR molecular identification of the fall armyworm in the Chontalpa region, Tabasco, Mexico

Ramos-Hernández,

Ortíz-García,

Cordova-Sánchez

et al. 2023

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O Objective: To perform the first molecular characterization of the barcoding COI region of the S. frugiperda found in Tabasco and to test whether it can reliably identify the strain detected in the said state. Design/Methodology/Approach: We collected S. frugiperda specimens using four pheromone traps placed in corn plots. Subsequently, we implemented DNA extraction, PCR with LCO-L/HCO-L primers, and the sequencing of six individuals captured in the traps. Results: After aligning the sequences, we developed a phylogenetic tree, determining that S. frugiperda belongs to the rice strain (RS). Implications: Identifying the S. frugiperda strain is necessary for management purposes, since different strains may require different control methods. Findings/Conclusions: Our study revealed that the isolates from Chontalpa, Tabasco, Mexico, match the RS fall armyworm reported in other latitudes. Consequently, this is the first report to identify this strain of S. frugiperda in Tabasco. Our findings are relevant because this species can potentially become a pest in sugarcane- and rice-growing areas of the state.

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“…U72977) and CS (Accession No. U72974) in previous studies (Maruthadurai and Ramesh, 2020;Nelly et al, 2021;Sarr et al, 2021).…”

Section: Dna Sequence Analysismentioning

confidence: 85%

PCR molecular identification of the fall armyworm in the Chontalpa region, Tabasco, Mexico

Ramos-Hernández,

Ortíz-García,

Cordova-Sánchez

et al. 2023

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“…The model does not consider the influence of different host plant species on the life-history (Chen et al 2022), the dynamics, and the distribution of S. frugiperda (Baloch et al 2020). Another source of uncertainty not considered in the model is represented by variability in the physiological responses associated with different strains of the species that might reach Europe (Sarr et al 2021). The scenario-based approach we implemented seeks to cover part of the issues linked to parameters' estimates and model's limitations.…”

Section: Discussionmentioning

confidence: 99%

Assessing the risk of establishment and transient populations of Spodoptera frugiperda in Europe

et al. 2022

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The fall armyworm, Spodoptera frugiperda (J.E. Smith), is an invasive pest threatening crop production and food security worldwide. High concerns are linked to the potential establishment of the species in Europe. The high migratory capacity of S. frugiperda causes concerns about the potential impacts of transient populations invading new areas from suitable hotspots. In the present work, we developed and used a physiologically-based demographic model to quantitatively assess the risks of S. frugiperda in Europe. The risks were assessed considering a best-, a median-, and a worst-case scenario. The Mediterranean coastal areas of Southern Europe resulted particularly suitable for the establishment of the species, with suitable areas reaching even higher latitudes, in the worst-case scenario. In Europe, up to four generations per year were predicted. The predicted yearly average number of moths per trap per week (± standard deviation) was 5 (± 4), 17 (± 5), and 139 (± 22) in the best, median-, and worst-case assessment scenarios, respectively. Model results showed that Southern and Central Europe up to the 48th parallel north might be exposed to the risk of transient populations. Depending on the latitude and on the period of arrival of the propagule, 1–2 transient generations per year might be expected. The model can be used to define strategies for reducing the risks of establishment of the pest at the country level. Predictions on the dynamics and phenology of the pest can also be used to support its management at the local level.

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“…There are indications that this divergence occurred about 2 Myr ago (Kergoat et al, 2021(Kergoat et al, , 2012.These strains differ in their performance and preference for host plants, and the correct classification of these two strains of the FAW is still controversial. Some authors refer to them as "sibling species" (Drès and Mallet, 2002;Dumas et al, 2015), "host strains" (Pashley, 1986;Prowell et al, 2004), "host form" (Juárez et al, 2014) and "morphocryptic strains" (Sarr et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Non-Targeted Metabolomics Reveal Differences in the Metabolic Profile of the Fall Armyworm Strains When Feeding Different Food Sources

Oliveira

Phelan

Labate

et al. 2022

Preprint

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Spodoptera frugiperda, the fall armyworm (FAW), is an important polyphagous agricultural pest feeding on nearly 350 host plants. FAW is undergoing incipient speciation with two well-characterized host-adapted strains, the "corn" (CS) and "rice" (RS) strains, which are morphologically identical but carry several genes under positive selection for host adaptation. We used non-targeted metabolomics based on gas chromatography/mass spectrometry to identify differences in metabolite profiles of the larval gut of CS and RS feeding on different host plants. Larvae were fed on artificial diet, maize, rice, or cotton leaves from eclosion to the sixth instar, when they had their midgut dissected for the analysis. This study revealed that the midgut metabolome of FAW varied due to larval diet and differed between the FAW host-adapted strains. Additionally, we identified several candidate metabolites that may be involved in the adaptation of CS and RS to their host plants. Our findings provide clues toward the gut metabolic activities of the FAW strains.

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Strain composition and genetic diversity of the fall armyworm Spodoptera frugiperda (Lepidoptera, Noctuidae): new insights from seven countries in West Africa

Cited by 8 publications

References 48 publications

PCR molecular identification of the fall armyworm in the Chontalpa region, Tabasco, Mexico

PCR molecular identification of the fall armyworm in the Chontalpa region, Tabasco, Mexico

Assessing the risk of establishment and transient populations of Spodoptera frugiperda in Europe

Non-Targeted Metabolomics Reveal Differences in the Metabolic Profile of the Fall Armyworm Strains When Feeding Different Food Sources

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