Strain composition and genetic diversity of the fall armyworm Spodoptera frugiperda (Lepidoptera, Noctuidae) : new insights from seven countries in West Africa
In: ISSN: 1742-7584 ; International Journal of Tropical Insect Science ; https://hal.inrae.fr/hal-03226004, 2021
academicJournal
Zugriff:
International audience ; The fall armyworm (FAW), Spodoptera frugiperda, a major agricultural insect pest in the Western Hemisphere, currently also poses a significant threat to many cereal crops in Africa. FAW consists of two morphocryptic strains, the corn- and the rice strains, which were thought to display typical genetic, physiological and behavioural features. However, this is not absolutely true, rendering direct identification and distribution of the strains impossible in field. Thus, to investigate 1) the composition and diversity of FAW strains, 2) their distribution at various spatial scales, and 3) the host plants they use, in invaded countries we used the COI barcode fragment, a marker capable of accurately distinguishing the two strains. A total of 125 specimens mainly sampled on maize in Niger and Senegal and to a lesser extent in Guinea, Mali, Togo, Burkina Faso and Cape Verde were analyzed. Sixteen haplotypes were identified among which two occurred very frequently. Phylogenetic analysis delineated two lineages, the rice and corn strains, but no typical geographical and host-plant patterns were found. The FAW-strain haplotypes derived from West African specimens were genetically comparable with those sampled elsewhere in Africa, the Americas and Asia. Considering all sites and plants sampled, the corn strain slightly predominated but on maize, the two strains were statistically comparable. Their distribution is largely sympatric at region, field and even maize plant scales. These findings are compared to populations recorded elsewhere and are discussed in the framework of biological invasions, and the management and ecology of the species.
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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
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Autor/in / Beteiligte Person: | Sarr, Oumar Mal ; Garba, Madougou ; Bal, Amadou Bocar ; Hima, Karmadine ; Ndiaye, Mbaye ; Fossoud, Amandine ; Clamens, Anne-Laure ; Tavoillot, Johannes ; Gauthier, Nathalie ; Université Gaston Berger de Saint-Louis Sénégal (UGB) ; S2ATA, UFR ; Direction Générale de la Protection des Végétaux ; Ministère de l'Agriculture du Niger ; Université Abdou Moumouni Niamey ; Comité permanent Inter-États de Lutte contre la Sécheresse au Sahel (CILSS) ; Centre Régional AGRHYMET (CRA) ; Centre de Biologie pour la Gestion des Populations (UMR CBGP) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD France-Sud )-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) ; This study was mainly funded by the Institut de Recherche pour le Developpement (IRD), France, through funds provided to the International Research Grouping-South (IRG-South) on Biological Invasions in West African countries and a PhD grant for O.M. Sarr. The West Africa Productivity Programme (WAAP/PPAAO) in Niger provided additional financial support. |
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Zeitschrift: | ISSN: 1742-7584 ; International Journal of Tropical Insect Science ; https://hal.inrae.fr/hal-03226004, 2021 |
Veröffentlichung: | HAL CCSD ; Cambridge University Press (CUP), 2021 |
Medientyp: | academicJournal |
DOI: | 10.1007/s42690-021-00450-6 |
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