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¹ Batı Akdeniz Tarımsal Araştırma Enstitüsü-ANTALYA Viewed : 2033 - Downloaded : 4048 Low temperatures (frost) lived in some years can affect tree and fruit growth in avacado cultivation areas. Factors in tolerance of avacado to cool temperatures such as genetic structure, old and season in which plant was exposured can change damage levels. Lula`, `Reed` and `Pinkerton` varieties were high susceptible, `Hass`, `Santana` and `Rincon` were susceptible, Bacon`, `Ettinger` `Fuerte and `Zutano` slightly affected from cool temperatures under 0 ºC temperatures lived during 24 h and up to -3 ºC in observations done in 2004 under Antalya conditions. A intensity in fruit falling was determined after 7-15th day of frost. High temperatures have not negatively affected to tree growth, blossom and fruit growth seasons of avacado. Although excessive high temperature values were determined in some seasons in Antalya conditions, any significantly negative affect of high temperatures (average temperature under 35 ºC) on blossom, fruit growth, and foliage parts was determined between April and August under Antalya conditions. Keywords : Avocado (Persea americana Mill.), Cultivars, Low temperature, Hardiness