CGMMV, originally described in 1935, was first reported in the U.S. in a melon seed production field in California in the summer of 2013. If was detected again in California in 2014 in a commercial seedless watermelon field, but has not been reported elsewhere in the U.S. The disease has long been known in Europe, Asia, the Middle East, and more recently in Canada. CGMMV is a member of the genus Tobamovirus, which also includes the well-known Tobacco mosaic virus (TMV). It has a narrow host range that is primarily limited to cucurbit species, including watermelon, melon, cucumber and rootstock.
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