Studies on the Mild Strain Cross-Protection of Papaya Ringspot Virus
Abstract: The present paper reported the effects of the ineeulum concentration of protecting strain and challenge strain,position of challange inoculation on the effectiveness of PRV mild strain cross-protection.Some technical aspocts in developing and implementing a cross protection program were suggestedbased on the exporimental results.Furthermore,it was found that the breakdown of cross-protection,asdefined by the appearance of symptoms caused by the severe strains,was related to the increase in virusconcentratio...