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One of the most important methods to create variability in apple breeding, in order to obtain new valuable cultivars, remains intraspecific hybridizations and, the success of creating new apple cultivars depends on the availability of sufficient genetic diversity. The response to apple scab and powdery mildew attack of 469 F1 hybrids (in 2 nd -3 th year of age) belonging to six combinations were analyzed. The response of hybrids to diseases attack was assessed depending of the genitors and type of hybridization (direct and reciprocal crosses). Under natural conditions of infection, without fungicide treatments, a high variability was recorded inside the cross combination. For apple scab, the coefficient of variability (CV%) had values between 12.2% (‘Crimson Crisp’ × ‘Topaz’) and 55.5% (‘Ariane’ × ‘Gala’), and for powdery mildew attack between 68.3% (‘Crimson Crisp’ × ‘Topaz’) and 85.6 % (‘Gala’ × ‘Ariane’). For some apple varieties (i.e. 'Topaz', 'Ariane'), the immunity or the monogenic resistance to scab has not been confirmed, and the heterosis in the hybrid progeny was calculated, being a hypothetical model of quantitative heredity, in order to identifying the progeny with high heterosis effect on scab and powdery mildew resistance. Cuvinte cheie: hibridare, puieți hibrizi, rapăn, făinare

RESPONSE TO APPLE SCAB AND POWDERY MILDEW ATTACK OF DIRECT AND RECIPROCAL F1 APPLE HYBRIDS