Bio-physical properties of the papaya ringspot virus causing ringspot disease in papaya (Carica papaya L.)

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 tropi cal and sub tropical countries. The virus contains ribo nucleic acid (RNA) with filamentous particle. The dilution end point of papaya ringspot 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.