The Fall Armyworm and Larger Grain Borer Pest Invasions in Africa: Drivers, Impacts and Implications for Food Systems

• Published in: Biology (Basel, Switzerland) Switzerland), 2024-02, Vol.13 (3), p.160
• Main Authors: Mlambo, Shaw, Mubayiwa, Macdonald, Tarusikirwa, Vimbai L, Machekano, Honest, Mvumi, Brighton M, Nyamukondiwa, Casper
• Format: Article
• Language: English
• Subjects: Agricultural ecosystems; Agricultural production; Agricultural products; alien pest invasions; Borers; Cassava; Climate change; Corn; Crops; Ecosystems; food and nutrition security; Food chains; Food quality; Food security; Global temperature changes; Grain; Insect pests; International trade; Introduced species; invasive insect species; Invasive species; Management; Mixed cropping; Natural enemies; Nutrition; Organic farming; Pest control; Pesticide resistance; Physiology; Prostephanus truncatus; Review; Sorghum; Spodoptera frugiperda; Strategic planning (Business); Sustainable development; Temperature tolerance
• ISSN: 2079-7737; 2079-7737
• DOI: 10.3390/biology13030160

Invasive alien species (IAS) are a major biosecurity threat affecting globalisation and the international trade of agricultural products and natural ecosystems. In recent decades, for example, field crop and postharvest grain insect pests have independently accounted for a significant decline in food quantity and quality. Nevertheless, how their interaction and cumulative effects along the ever-evolving field production to postharvest continuum contribute towards food insecurity remain scant in the literature. To address this within the context of Africa, we focus on the fall armyworm, (J.E. Smith) (Lepidoptera: Noctuidae), and the larger grain borer, (Horn) (Coleoptera: Bostrichidae), two of the most important field and postharvest IAS, respectively, that have invaded Africa. Both insect pests have shown high invasion success, managing to establish themselves in >50% of the African continent within a decade post-introduction. The successive and summative nature of field and postharvest damage by invasive insect pests on the same crop along its value chain results in exacerbated food losses. This systematic review assesses the drivers, impacts and management of the fall armyworm and larger grain borer and their effects on food systems in Africa. Interrogating these issues is important in early warning systems, holistic management of IAS, maintenance of integral food systems in Africa and the development of effective management strategies.