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Assessment of damage caused by evolved fall armyworm on native and transgenic maize in South Africa

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Abstract

The fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is a transboundary polyphagous insect pest which preferentially feeds on grain crops. The FAW was responsible for economic damage to maize crops in more than 44 African countries by 2019 accounting for the loss of over US$2–5.5 billion. The parallel cultivation of Bt-maize expressing Cry1Ab protein and indigenous maize varieties in some African countries was aimed to enhance output and mitigate the harmful impact of the Lepidopteran insect below the economic injury level. A total of six maize farms (holding at least 4–20 ha of land) in delocalized geographies of Gauteng province, South Africa were randomly selected and assessed for the impact of FAW during the 2017 outbreak. A biotype of S. frugiperda that significantly destroyed Bt maize and non-Bt maize and exhibited tolerance to pesticides under field conditions is reported. It is observed that, whether maize at the tasseling stage carried the Cry1Ab trait or not, S. frugiperda caused a minimum damage of ~62.6% (P < 0.05, P = 0.0001, |t| = 2.78) and maximum damage of ~83.33% (P < 0.05, P = 0.0001, |t| = 2.78) in farms without refuge strategies. Phylogenetic analysis using the mitochondrial cytochrome oxidase I gene, revealed divergent evolution amongst reported S. frugiperda lineages, the emergence of singleton, and distinct haplotypes within the African continent. It is concluded that S. frugiperda that invaded maize farms in the Gauteng region of South Africa is genetically evolved from those identified in São Tomé and Príncipe, and Nigeria, and tolerant to certain insecticides. Thus, the African continent might have been invaded by several routes and distinct haplotypes.

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Acknowledgments

The authors are grateful to Mr. Pierre who allowed his farms and the investigator to conceive the approach for pesticide application and for using his genetically modified Cry1Ab–maize plants and Vaal University Technology Post-Doctoral fellowship.

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Authors and Affiliations

  1. Department of Biotechnology, Vaal University of Technology, Vanderbijlpark, Gauteng, South Africa

    Louis Bengyella & Bakoena Ashton Hetsa

  2. Department of Biological Control, Advanced Biotech Cooperative, Bali Nyonga, Cameroon

    Louis Bengyella & Dobgima J. Fonmboh

  3. Genetic Division, American Farm Consulting, Wenatchee, WA, USA

    Louis Bengyella

  4. Department of Pharmacy, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa

    Bakoena Ashton Hetsa

  5. Department of Nutrition, Food Science and Bioresource Technology, The University of Bamenda, Bamenda, Cameroon

    Dobgima J. Fonmboh

  6. Life Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, 781035, India

    Robinson C. Jose

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  1. Louis Bengyella
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Correspondence to Louis Bengyella.

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Bengyella, L., Hetsa, B.A., Fonmboh, D.J. et al. Assessment of damage caused by evolved fall armyworm on native and transgenic maize in South Africa. Phytoparasitica 49, 1–12 (2021). https://doi.org/10.1007/s12600-020-00862-z

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