Warming may expand cassava zones in Africa while raising disease pressure
New modeling suggests cassava can spread to more African regions, but cassava brown streak disease risk may expand even faster.
Climate change is creating a two-sided outlook for cassava in Africa. The Conversation reports that cassava remains a core food crop for hundreds of millions of people, with sub-Saharan Africa producing more than 63% of global supply. Nigeria alone contributes over one-fifth of world output, so shifts in cassava performance have direct food-security implications.
The study mapped current and future suitability using climate and distribution data. It estimated that about 54.6% of Africa’s land area, roughly 16.2 million square kilometers, is currently suitable for cassava growth. Under warmer scenarios, suitable and highly suitable zones could expand further across parts of West, Central, and East Africa.
However, the same warming trend favors cassava brown streak disease spread through whitefly vectors, especially Bemisia tabaci. The analysis indicates that a large share of the continent is already exposed to disease risk, and vulnerability could rise to around 55–57% of Africa by 2050. The projected westward spread into major cassava-producing areas is a particular concern for regional food systems.
This creates a policy challenge: more potential growing area does not automatically mean secure production. The authors argue for earlier deployment of tolerant or resistant varieties and tighter controls on movement of planting material across borders and production zones. Without these measures, expanding cultivation frontiers could also become channels for faster pathogen transfer.
For agronomic planning, the key message is integration. Climate adaptation for cassava needs to be paired with plant-health surveillance, seed-system discipline, and vector management. Otherwise, expected gains from wider climatic suitability may be offset by disease losses in countries where cassava is central to daily calories and rural income.