A preliminary study to determine the character (obligate or facultative) of the mycorrhizal association in, naranjilla (Solanum quitoense L.) and an evaluation of nine mycorrhiza stock, was carried out at Palmira (1050 m, 24°C and R.H. of 60 %) and Jamundi (2100 m, 14°C and R.H. of 80 %). The trial was held on two oxyzole having a lowand moderate fertility, with 3 levels of phosphorus (0,50 Y 100 kq/ha). The naranjilla is a facultative mycotrophic specie. In general, the inoculation with MVA fungi, increased the development of the naranjilla in seed beds as well as transplanted seed lings. The effectivity of MVA was dependent on the fungus specie, its origin, the phosphorus levels in the soil and the weather of both Iocalities. The development of the naranjilla and the effectivity of the mycorrhiza was superior at the locality (14°C). In general, the isolations which showed the best behavior were a mixture of Acaulospora spp and Glomus sp, and Enthrophospora colombiana.