Watermelon mosaic virus (WMV) also known as Marrow mosaic virus, Melon mosaic virus, and until recently Watermelon mosaic virus type 2 (WMV-2), is a plant pathogenic virus that causes viral infection (sometimes referred to as watermelon Mosaic disease) in many different plants. First described on squash in Florida, WMV arose from a unique recombination of genetic material contributed by Soybean mosaic virus (SMV) and Bean common mosaic virus (BCMV) along with Peanut Stripe virus (PSV).
Watermelon mosaic virus 2, A virus with RNA-containing flexuous filamentous particles c. 760 nm long. It induces cylindrical (pinwheel) inclusions in the cytoplasm of host cells. It is readily mechanically transmissible, is transmissible by many species of aphid in a non-persistent manner and has a moderately wide host range. It causes diseases of various cucurbits, and is also found in natural infections of several leguminous and malvaceous species. Widely distributed throughout the world. Causes mosaic and mottle diseases of cantaloupe, cucumber, pumpkin, squash and watermelon. Reduces fruit production and quality in squash and other cucurbits. Also causes mottle diseases of pea and occurs naturally in various leguminous, malvaceous, and chenopodiaceous weeds, ornamentals and crop plants.