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Melon necrotic spot virus (MNSV) is a RNA virus with isometric particles, 30 nm in diameter. MNSV is transmitted by the chytrid fungus Olpidium radicaleand is easily transmitted by sap inoculation. Seed transmission ratios of 10 -40 percent have been reported in melon. It occurs in Japan, the Netherlands, the UK, and the USA.
MNSV occurs naturally only in greenhouse melons and cucumbers, and causes significant decrease in yield. The virus causes necrotic spots or large necrotic lesions on the leaves and necrosis on the stems of greenhouse melons and cucumbers.