Papaya ring spot virus (PRSV), a member of Potyviridae, is one of the devastating virus of the papaya and causes yield loss more than 90 per cent. It has proved as major constraint for successful cultivation of this crop in the tropical and sub tropical countries. The virus contains ribonucleic acid (RNA) with filamentous particle. The dilution end point of papaya ring spot virus was recorded between 1 x 10-3 to 1 x 10-4 thermal inactivation point between 50–55°C and longevity in vitro between 8 to 10 hrs.
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