01280naa a2200217 a 450000100080000000500110000800800410001902200140006010000150007424500940008926000090018352006900019265000160088265000140089865300210091265300190093365300290095270000160098170000210099777300440101816327651993-09-09       1991    bl uuuu     u00u1 u    #d  a0041-43601 aRIVERA, C.  aPapaya ringspot virus and cucumber mosaic virus associated with a severe mosaic in melon.  c1991  aSevere mosaic disease was observed in several melon fields in Costa Rica during the period 1987 - 1991. Two viruses, papaya ringsport virus (PRSV) and ducumber mosaic virus (CMV) were associated in single and mixed infections with the mosaic disease. These viruses were partially characterized on the basis of the type of cytoplasmic inclusions observed by light microscopy, the size and morphology of the virus particles by electron microscopy, and the serological relationships with members of the potyviruses and cucumoviruses groups using immunodiffusion and immunoelectrophoretic transfer of proteins. This is the first report of PRSV and CMV occurring on cucurbits in Costa Rica.  aCucumovirus  aPotyvirus  aCucurbit viruses  aIdentificacion  aPartial characterization1 aRAMIREZ, P.1 aRODRIGUEZ, C. M.  tTurrialba.gv.41, n.3, p.437-443, 1991.