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Do the invasive Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), and the maize lepidopteran stemborers compete when sharing the same food?

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Abstract

In insect communities, the outcome of intra- and inter-specific competitions for food utilisation depend primarily upon density and duration even inter-specific competitions can occur when they are not sharing the same feeding niche such as between foliar feeders and stemborers. Experimental manipulations of larval densities and the durations of common diet feeding of fall armyworm (FAW), S. frugiperda, and the African lepidopteran stemborers, Busseola fusca, Sesamia calamistis and Chilo partellus, were conducted to determine how the density and the duration of resource utilization affected larval survival and the relative growth rate (RGR) in intra- and inter-specific interactions. The results showed both intra- and interspecific competitions were observed among all the four species and interspecific competition was significantly stronger between the stemborers than between the FAW and the stemborers. The results showed that multiple infestations of cereal plants with low larval densities of each species at optimum conditions will very likely prolong the coexistence between FAW and stemborers. In addition, the time partitioning of the resource use significantly influenced this coexistence.

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Acknowledgements

The authors wish to thank the German Academic Exchange Service (DAAD) for funding the PhD fellowship under the grant number 91636630, and the University of Nairobi and icipe Capacity Building Program (ARPPIS) for hosting the PhD student. This research was funded by the ‘Institut de Recherche pour le Développement’ (IRD)-France through the IRD Collaborative Research project (grant number B4405B) and the integrated pest management strategy to counter the threat of invasive fall armyworm to food security in eastern Africa (FAW-IPM) (grant number DCI-FOOD/2017/) financed through the European Union. We also acknowledge the financial support for this research by the following organizations and agencies: the UK’s Department for International Development (DFID), the Swedish International Development Cooperation Agency (SIDA), the Swiss Agency for Development and Cooperation (SDC), and the Kenyan Government. Thanks are also due to the stemborer rearing unit at the ARCU-icipe, especially to Josphat Akhobe and John Buluma, for rearing and supplying insect larvae and artificial diets. Thanks also to Fritz Schulthess for his critical review of the manuscript and his English correction.

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  1. International Centre of Insect Physiology and Ecology (icipe), P.O. Box 30772-00100, Nairobi, Kenya

    Bonoukpoè Mawuko Sokame, Peter Malusi, Sevgan Subramanian & Paul-André Calatayud

  2. Department of Plant Science and Crop protection, University of Nairobi, P.O. Box, 29053 00625, Kangemi, Nairobi, Kenya

    Bonoukpoè Mawuko Sokame & Dora Chao Kilalo

  3. Department of Biochemistry, University of Nairobi, P.O. Box 30197, Nairobi, -00100, Kenya

    Gerald Juma

  4. IRD, CNRS, Université Paris-Saclay, UMR Évolution, Génomes, Comportement et Écologie, 91198, Gif-sur-Yvette, France

    Paul-André Calatayud

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Sokame, B.M., Malusi, P., Subramanian, S. et al. Do the invasive Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), and the maize lepidopteran stemborers compete when sharing the same food?. Phytoparasitica 50, 21–34 (2022). https://doi.org/10.1007/s12600-021-00952-6

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