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The Province of Mendoza is ubicated in the Mid-Western part of Republica Argentina with an extention of 150.830 km(2). There all agrarian and forestry activities are concentrated in a 3% of its territory which is able to be irrigated. On the West side part of the province by the border with Republic of Chile appears the mountain ridge (Cordillera de Los Andes) which is a part of the fitogeographical region called Andinian Desert. It extents for over 500 km with an average wide of 100 km.

This work is aimed to evaluate survival and behaiviours of different species of conifers in the mountanious country side of Mendoza. To do so there was installed an experimental plots in Yaucha dam, placed in San Carlos department at 34 degrees 00’ S and 69 degrees 07’ W, at an altitude of 1.213 mosl.

Species on test were Pinus pinea L., Pinus halepensis Mill., and Cupressus arizonica Greene. For the experience were used plants of approximately 0.70 m height and were installed at a definite plantation distance of 3 x 3 m whit surface irrigation stream water by furrows. Periodically dasometric data is taken about diameter, chest height of every plant, total average height of trees of each specie, registering failures and sanitary situation.

Results obtained at the age of 17 years are: Pinus pinea: average diameter 17 cm, height 6.60 m, failure 22.5%; Pinus hale-pensis: average diameter 16 cm, height 8.60 m, failure 12.2%; Cupressus arizonica: average diameter 20 cm, height 7.75 m, failure 18.1%. It is to be noted that Pinus pinea presents 6% of low height forked branches. All species are in good sanitary shape not registering any pests or diseases affecting the experiment up to date.