Peach and nectarine have a relatively large variation in the ontree maturity; due to this variability it is essential to apply successive harvests. Maturity at harvest is usually determined based on commercial size and diameter, background color and flesh firmness (Crisosto and Valero, 2008). However, color can be hardly distinguished in some cultivars as an intense blush is developed before the fruit is ripe for harvest, while firmness determination is carried out in a destructive manner, and may vary