Modeling the potential global distribution of the Egyptian cotton leafworm, Spodoptera littoralis under climate change

The Egyptian cotton leafworm, Spodoptera littoralis is a highly invasive insect pest that causes extensive damage to many of the primary food crops. Considering the recent challenges facing global food production including climate change, knowledge about the invasive potential of this pest is essential. In this study, the maximum entropy model (MaxEnt) was used to predict the current global spatial distribution of the pest and the future distribution using two representative concentration pathways (RCPs) 2.6 and 8.5 in 2050 and 2070. High AUC and TSS values indicated model accuracy and high performance. Response curves showed that the optimal temperature for the S.littoralis is between 10 and 28 degree celsius. The pest is currently found in Africa and is widely distributed across the Middle East and throughout Southern Europe. MaxEnt results revealed that the insect will shift towards Northern Europe and the Americas. Further, China was seen to have a suitable climate. We also extrapolated the impact of these results on major producing countries and how this affects trade flow, which help decision makers to take the invasiveness of such destructive pest into their account.

Automated summary

This study predicted the global distribution of the Egyptian cotton leafworm using the maximum entropy model and projected its future distribution. The results indicate that the pest will shift towards Northern Europe and the Americas, with China having a suitable climate for its survival. The study also analyzed the impact of these results on major producing countries and trade flow.