Complex multiple introductions drive fall armyworm invasions into Asia and Australia

Rane, Rahul and Walsh, Thomas K. and Lenancker, Pauline and Gock, Andrew and Dao, Thi Hang and Nguyen, Van Liem and Khin, Thein Nyunt and Amalin, Divina and Chittarath, Khonesavanh and Faheem, Muhammad and Annamalai, Sivapragasam and Thanarajoo, Sathis Sri and Trisyono, Y. Andi and Khay, Sathya and Kim, Juil and Kuniata, Lastus and Powell, Kevin and Kalyebi, Andrew and Otim, Michael H. and Nam, Kiwoong and d’Alençon, Emmanuelle and Gordon, Karl H. J. and Tay, Wee Tek (2023) Complex multiple introductions drive fall armyworm invasions into Asia and Australia. Scientific Reports, 13 (1): 660. ISSN 20452322

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Abstract

The fall armyworm (FAW) Spodoptera frugiperda is thought to have undergone a rapid ‘west-to-east’ spread since 2016 when it was first identified in western Africa. Between 2018 and 2020, it was recorded from South Asia (SA), Southeast Asia (SEA), East Asia (EA), and Pacific/Australia (PA). Population genomic analyses enabled the understanding of pathways, population sources, and gene flow in this notorious agricultural pest species. Using neutral single nucleotide polymorphic (SNP) DNA markers, we detected genome introgression that suggested most populations in this study were overwhelmingly C- and R-strain hybrids (n = 252/262). SNP and mitochondrial DNA markers identified multiple introductions that were most parsimoniously explained by anthropogenic-assisted spread, i.e., associated with international trade of live/fresh plants and plant products, and involved ‘bridgehead populations’ in countries to enable successful pest establishment in neighbouring countries. Distinct population genomic signatures between Myanmar and China do not support the ‘African origin spread’ nor the ‘Myanmar source population to China’ hypotheses. Significant genetic differentiation between populations from different Australian states supported multiple pathways involving distinct SEA populations. Our study identified Asia as a biosecurity hotspot and a FAW genetic melting pot, and demonstrated the use of genome analysis to disentangle preventable human-assisted pest introductions from unpreventable natural pest spread.

Item Type: Article
Additional Information: Cited by: 15; All Open Access, Gold Open Access
Subjects: S Agriculture > S Agriculture (General)
Divisions: Faculty of Agriculture > Department of Plant Protection
Depositing User: Laili Hidayah Hidayah
Date Deposited: 27 Aug 2024 06:33
Last Modified: 27 Aug 2024 06:33
URI: https://ir.lib.ugm.ac.id/id/eprint/3230

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