by cassava mosaic geminiviruses, has devastated cassava crops in 12 countries of East and
Central Africa since the late 1980s. Region-level surveys have revealed a continuing pattern
of annual spread westward and southward along a contiguous 'front'. More recently,
outbreaks of cassava brown streak disease (CBSD) were reported from Uganda and other
parts of East Africa that had been hitherto unaffected by the disease. Recent survey data …