CPMV, or Cowpea Mosaic Virus, is a plant virus that primarily affects cowpea plants, but can also infect other legumes such as soybeans and mung beans. It is a member of the Bromoviridae family and is transmitted by aphids. CPMV is characterized by mosaic patterns on the leaves, stunted growth, and reduced yield in infected plants. While it can cause significant damage to crops, CPMV is also used in biotechnology research as a tool for gene expression and protein production.