Towards estimating the economic cost of invasive alien species to African crop and livestock production
Eschen, Rene, Beale, Tim, Bonnin, J. Miguel, Constantine, Kate L., Duah, Solomon, Finch, Elizabeth A., Makale, Fernadis, Nunda, Winnie, Ogunmodede, Adewale, Pratt, Corin F., Thompson, Emma, Williams, Frances, Witt, Arne and Taylor, Bryony (2021) Towards estimating the economic cost of invasive alien species to African crop and livestock production. CABI Agriculture and Bioscience, 2 (1).
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Abstract
Background: Invasive alien species (IAS) cause signifcant economic losses in all parts of the world. Although IAS are widespread in Africa and cause serious negative impacts on livelihoods as a result of yield losses and increased labour costs associated with IAS management, few data on the impacts are available in the literature and the magnitude and extent of the costs are largely unknown. We estimated the cost of IAS to agriculture, the most important economic sector in Africa. Methods: Data on the monetary costs of IAS to mainland Africa as well as information about the presence and abundance of the most important IAS were collected through literature review and an online survey among a wide variety of stakeholders. Using this and additional data from publicly available sources we estimated yield losses and management costs due to IAS in agriculture for individual countries and the entire continent. Where the data allowed, the costs for selected IAS or crops were estimated separately. The estimates were extrapolated using production and distribution data and/or matching of agro-ecological zones. Results: The total estimated annual cost of IAS to agriculture in Africa is USD 65.58 Bn. Management costs (comprising mainly labour costs associated with weeding), crop yield losses and reductions in livestock derived income constitute the majority of the estimated cost (55.42, 44.31 and 0.26 percent, respectively). The IAS causing the highest yield losses was Spodoptera frugiperda (USD 9.4 Bn). Conclusions: This study reveals the extent and scale of the economic impacts of IAS in the agricultural sector in one of the least studied continents. Although the cost estimate presented here is signifcant, IAS also cause major costs to other sectors which could not be assessed due to data defcit. The results highlight the need for pre-emptive management options, such as prevention and early detection and rapid response to reduce huge potential future costs, as well as measures that contribute to large-scale control of widely established IAS at little cost to farmers and other afected land users, to reduce losses and improve livelihoods.
| Item Type: | Article |
|---|---|
| Keywords: | Economic impact, Labour costs, Livestock derived income, Management, Pests and diseases, Weeds, Yield loss |
| Divisions: | Land and Property Management |
| Depositing User: | Adewale .Ogunmodede |
| Date Deposited: | 31 Oct 2024 18:17 |
| Last Modified: | 31 Oct 2024 18:17 |
| URI: | https://rau.repository.guildhe.ac.uk/id/eprint/16810 |
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