Cucumber green mottle mosaic virus.
CGMMV is a species of virus in the genus Tobamovirus, which was first described in 1935 in England. Between 1935 and 1985 it spread slowly to other countries, but faster between 1986 and 2006, and rapidly between 2007 and 2018. It now occurs on all continents except South America. In cucurbits, it causes a damaging disease that reduces fruit yields and quality and spreads efficiently by plant-to-plant contact transmission. Outbreaks occur in many cucurbit crops including vegetables and fruits (e.g. squash and melons). CGMMV seed transmission occurs in at least nine different cucurbit crop species and this is the main way the virus has spread worldwide. Importation of contaminated seeds constitutes a considerable biosecurity concern for counties still without CGMMV. Its high stability and its persistence in contaminated plant material and soil allow it to survive between growing seasons, making eradication difficult.