Potato Aucuba Mosaic Virus (PAMV) is an uncommon pathogen of potato (Solanum tuberosum) which occurs worldwide. It is a single stranded RNA (ssRNA) virus with filamentous particles about 580 nm long and 11 nm wide and belongs to genus Potexvirus; family Alphaflexiviridae; order Tymovirales. PAMV is transmitted by aphids (Myzus persicae) in the presence of ‘helper’ viruses of the PVY group in a non-persistent manner and is readily transmitted by mechanical inoculation. It causes bright yellow spots on the lower leaves, later coalescing to form large yellow necrotic spots, often leading to systemic or top necrosis. Particles of potexviruses are composed of a single type of coat protein, which encapsidates a single molecule of 5' capped and 3' polyadenylated positive-stranded RNA differing in length from about 5.8 to 7 kb. The genomic RNA of PAMV is 7057 nucleotides in length excluding the poly (A) tail at the 3' end. The non-coding regions are 82 nucleotides at the 5' end and 76 nucleotides at the 3' end. A putative polyadenylation signal (AAUAAA) is also found at the extreme 3' end of the RNA and includes a part of the poly (A) tail. The genome contains five major putative open reading frames (ORFs), designated from the 5' terminus as encoding putative proteins with M of 187 K, 26 K, 12 K, 8 K and 27 K. The sizes and composition of the proteins encoded by the ORFs are generally similar to those found in other potexviruses.