Analysis of strain distribution, migratory potential, and invasion history of fall armyworm populations in northern Sub-Saharan Africa

Nagoshi, Rod; Goergen, Georg; Tounou, Kodjo Agbeko; Agboka, Komi; Koffi, Djima; Meagher, Robert L.

doi:10.1038/s41598-018-21954-1

Cited by 142 publications

(138 citation statements)

References 32 publications

Supporting

Mentioning

126

Contrasting

Unclassified

Order By: Relevance

“…Pheromone differences have been reported for the strains (Groot et al, 2008;Lima & McNeil, 2009), but the lures tested to date in the Western Hemisphere show no evidence of strain differences in their attractiveness Unbehend et al, 2013). However, our studies of fall armyworm from Africa found oddities in the composition and distribution of diagnostic strain markers that bring into question whether the strain preferring rice is present in Africa or is behaving as expected with respect to host preference (Nagoshi et al, 2018). However, our studies of fall armyworm from Africa found oddities in the composition and distribution of diagnostic strain markers that bring into question whether the strain preferring rice is present in Africa or is behaving as expected with respect to host preference (Nagoshi et al, 2018).…”

Section: Introductioncontrasting

confidence: 47%

See 1 more Smart Citation

Comparison of pheromone trap design and lures for Spodoptera frugiperda in Togo and genetic characterization of moths caught

Meagher¹,

Agboka

Tounou

et al. 2019

Entomologia Exp Applicata

Self Cite

View full text Add to dashboard Cite

Fall armyworm, Spodoptera frugiperda (JE Smith) (Lepidoptera: Noctuidae), is a pest of grain and vegetable crops endemic to the Western Hemisphere that has recently become widespread in sub-Saharan Africa and has appeared in India. An important tool for monitoring S. frugiperda in the USA is pheromone trapping, which would be of value for use with African populations. Field experiments were conducted in Togo (West Africa) to compare capture of male fall armyworm using three commercially available pheromone lures and three trap designs. The objectives were to identify optimum trap 9 lure combinations with respect to sensitivity, specificity, and cost. Almost 400 moths were captured during the experiment. Differences were found in the number of S. frugiperda moths captured in the various trap designs and with the three pheromone lures, and in the number of non-target moths captured with each lure. The merits of each trap 9 lure combination are discussed with respect to use in Africa. A nearly equal number of COI-CS (161) and COI-RS (158) moths was captured with no differences found in COI marker proportions among traps or lures. However, the diagnostic rice strain marker Tpi was rarely found. Overall, the genetic characterization of the pheromone trap collections indicated a consistent distribution of genetic markers from 2016 to 2017, suggesting a population at or near equilibrium.

show abstract

Section: Introductioncontrasting

confidence: 47%

“…Larval data from Africa were used from a previous study (Nagoshi et al, 2018). Larval data from Africa were used from a previous study (Nagoshi et al, 2018).…”

Section: Analyzing Tpi Strain Markersmentioning

confidence: 99%

Comparison of pheromone trap design and lures for Spodoptera frugiperda in Togo and genetic characterization of moths caught

Meagher¹,

Agboka

Tounou

et al. 2019

Entomologia Exp Applicata

Self Cite

View full text Add to dashboard Cite

show abstract

“…The multiple inter-continental invasions of the fall armyworm is a serious global issue in agriculture. A marker-based study shows that these invasive populations were originated from the Florida-Caribbean region 45 . Therefore, the invasive population might carry the insecticide resistance CNVs, identified in this study.…”

Section: Discussionmentioning

confidence: 99%

Adaptation by copy number variation increases insecticide resistance in fall armyworms

Nam

Gimenez

Hilliou³

et al. 2019

Preprint

View full text Add to dashboard Cite

Insecticide resistance is a major main challenge in pest control, and understanding its genetic basis is a key topic in agricultural ecology. Detoxification genes are well-known genetic elements that play a key role in adaptation to xenobiotics. The adaptive evolution of detoxification genes by copy number variations has been interpreted as a cause of insecticide resistance. However, the same pattern can be generated by the adaptation to host-plant defense toxins as well. In this study, we tested in fall armyworms (Lepidoptera Spodoptera frugiperda) if adaptation by copy number variation is the cause of the increased level of insecticide resistance from two geographic populations with different levels of resistance and two strains with different host plants. Following the generation of an assembly with chromosome-sized scaffolds (N50 = 13.2Mb), we observed that these two populations show a significant allelic differentiation of copy number variations, which is not observed between strains. In particular, a locus with almost complete allelic differentiation (Fst > 0.8) includes a cluster of P450 genes, which are well-known key players in detoxification. Detoxification genes are overrepresented in the genes with copy number variations, and the observed copy number variation appears to have beneficial effects in general. From this result, we concluded that copy number variation of detoxification genes in fall armyworms plays a key role in the insecticide resistance but not in the adaptation to host-plants, suggesting that the evolution of insecticide resistance may occur independently from host-plant adaptation.

show abstract

“…The FAW at least consist of two morphological identical but genetically distinct subpopulations, the corn strain (C strain) and rice strain (R strain) 33-35 . The two strains have their own preferable host plants.…”

Section: Introductionmentioning

confidence: 99%

Chromosome level draft genomes of the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), an alien invasive pest in China

H¹,

Lan²,

Fang³

et al. 2019

Preprint

View full text Add to dashboard Cite

The fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith) is a severely destructive pest native to the Americas, but has now become an alien invasive pest in China, and causes significant economic loss. Therefore, in order to make effective management strategies, it is highly essential to understand genomic architecture and its genetic background. In this study, we assembled two chromosome scale genomes of the fall armyworm, representing one male and one female individual procured from Yunnan province of China. The genome sizes were identified as 542.42 Mb with N50 of 14.16 Mb, and 530.77 Mb with N50 of 14.89 Mb for the male and female FAW, respectively. We predicted about 22,201 genes in the male genome. We found the expansion of cytochrome P450 and glutathione s-transferase gene families, which are functionally related to the intensified detoxification and pesticides tolerance. Further population analyses of corn strain (C strain) and rice strain (R strain) revealed that the Chinese fall armyworm was most likely invaded from Africa. These strain information, genome features and possible invasion source described in this study will be extremely important for making effective strategies to manage the fall armyworms.

show abstract

Analysis of strain distribution, migratory potential, and invasion history of fall armyworm populations in northern Sub-Saharan Africa

Cited by 142 publications

References 32 publications

Comparison of pheromone trap design and lures for Spodoptera frugiperda in Togo and genetic characterization of moths caught

Comparison of pheromone trap design and lures for Spodoptera frugiperda in Togo and genetic characterization of moths caught

Adaptation by copy number variation increases insecticide resistance in fall armyworms

Chromosome level draft genomes of the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), an alien invasive pest in China

Contact Info

Product

Resources

About