Using Andigena potato materials received from International Potato Center (CIP) in 2005 as the parental clones, in the subtropical highland of Sa Pa (1,581 m above sea level), under the greenhouse conditions, in the first cycle of recurrent selection, from April 8 to September 8, 2007
253,895 hybrid true seeds (HYB'IS) of the 13 crosses of the virus resistant materials and 83,385 HYB TS of the 20 crosses of the late blight (Phytophthora infestans (Mont.) de Barry) resistant materials were generated. At the same location, from May 9 to October 9, 2010, in the second cycle of recurrent selection
166,854 HYB TS of the 22 crosses between virus resistant selected clones and 32,074 HYB TS of the 4 crosses between late blight resistant selected clones were generated. A great number of HYB TS (genotypes) mentioned above were valuable materials for evaluation and selection to identify the desirable genotypes for possible releasing as new potato varieties. The successful potato hybridization works in Sa Pa in 2007 and 2010 indicated that, the natural conditions in subtropical highland of Sa Pa are suitable for crossing work in potato breeding.