Cacao yellow mosaic virus (CYMV) is a virus in the family Tymoviridae that infects cacao trees in Sierra Leone.

CYMV, like other Tymoviridae are non-enveloped viruses, surrounded by a capsid approximately 30 nanometers wide.

[1] Tymoviridae have positive-sense single-stranded RNA genomes approximately 6 kilobases long.

[1] In the cacao tree, CYMV infection leads to the appearance of large circular yellow blotches on the leaves.

However, it can experimentally infect a number of other dicots including Chenopodium amaranticolor, Chenopodium quinoa, Tetragonia expansa, Vinca rosea, Nicotiana clevelandii, and Nicandra physalodes.