India, March 2 -- Cassava Brown Streak Disease threatens a staple crop relied on by millions across sub-Saharan Africa

Study warns more than a third of the continent is at risk of virus spread

Scientists urge stronger seed systems, surveillance and resistant varieties to prevent westward expansion

A viral disease that causes rot in cassava roots is threatening one of Africa's most important staple crops, raising concerns for millions of people who rely on it for food and income.

Cassava, valued for its tolerance to drought and poor soils, acts as a safety net for families across sub-Saharan Africa. But researchers warn that Cassava Brown Streak Disease (CBSD) could undermine that resilience.

The disease causes necrosis in the roots o...