Symptoms of PMTV are distributed widely in potatoes in the highlands (Andes) of Peru, but have not been found in coastal plantings; they were observed in 9 out of 22 Peruvian Departments. Incidences of over 10% of affected plants in one or more crops were found in 14 different localities. Thirteen cultivars with symptoms were observed, 9 were Solanum tuberosum subsp. andigena Juz. & Buk., 3 were hybrids of S. tuberosum subsp. andigena x S. tuberosum subsp. tuberosum L or S. Curtilobum Juz. & Buk. and 1 was S. juzepczukii Buk. Symptoms were also seen in 29 clones of the potato germplasm collection of the International Potato Center. Distribution and prevalence of PMTV in Peru appear to be related to those rainfall and temperature conditions that favour its fungus vector Spongospora subterranea (Wallr.) Lagerh.