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Cassava (Manihot esculenta) is an important tropical subsistence crop that is affected by cassava brown streak disease (CBSD) in Sub-Saharan Africa.CBSD is caused by two distinct virus species: Cassava brown streak virus (CBSV) and Ugandan Cassava brown streak virus (UCBSV).Both are whitefly-transmitted Ipomovirus with a (+)-sense single-stranded RNA genome of about 9 kb.