Scientists have announced an outbreak of a devastating wheat disease that could wipe out the entire crop in Kenya. The stem rust disease has affected farms in Njoro and was spreading fast, raising fears of a food shortage. A panel of experts working under the Global Rust Initiative sounded the alarm after a study to evaluate the threat of the disease first detected in Uganda in 1999. The initiative, which includes the Kenya Agricultural Research Institute, said the disease had the potential of spreading worldwide, causing a global catastrophe.