In hybrids of apple (Malus × domestica Bork.) subjected to study phenological in Aguanueva, Coahuila, Mexico, their requirements of chill hours (CH), heat units (HU), bud breaking flower and vegetative % (BB) for good adaptation to warm milder climate, bloom period (BP), and vegetative period (VP), were determined using the Methodology of Identification of New Cultivars of Fruit Breeding (Ploudiv 1983). They were material with requirements of cold from 200 up to 650 (CH) when they underwent a test of controlled conditions of (CH). These materials are; AR-109 (200 CH), AR-106 (300 CH), AR-108 (300 CH), AR-147 (300 CH), AR-144 (550 CH), and AR-a60 (650 CH), while the control Mutant Aguanueva II (500 CH). Under winter conditions of the year 2000 with so slone 168.76 (CH), some materials showed a bud break superior to the control. The bud break dates understand between 30 days before the witness Aguanueva II, as the hybrid AR-147 and 34 days later in the case of the hybrid AR-151, location this way to the materials as: Early with regard to the control; AR-16-S (24 days), AR-130 (14 days) and AR-147 (30 days). Similar to the control; AR-144, AR-103 and AR-127. Later than the control; AR-111 and AR-103-B. since they don't require spray bud breaking res compounds for their bud break and they have bloom period (BP) of 8 to 21 days. And when presenting low chill requirements they will be set fruit in a microclimate frost-free and growing and have their cultivation in a mild winter climate.
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