Abstract
High quality disease resistant apples are the main breeding objective in the programme at Agroscope Changins-Wadenswil (ACW). Apple scab caused by the fungus Venturia inaequalis is still the most important disease in apple production. To ensure the durability of scab resistance we are combining different resistance genes (pyramiding). Moreover, we are incorporating also resistances against powdery mildew (Podosphaera leucotricha) and fire blight (Erwinia amylovora). Principles and methods of resistance breeding are outlined and pyramiding of resistances is illustrated by analysing crosses between two cultivars carrying different scab resistance genes (Vf and Vh2). Crosses are being analysed applying marker-assisted selection (MAS) to detect plants carrying multiple resistances. Phenotypic screening of seedlings for scab symptoms and MAS results are compared and the observed segregations into resistant and susceptible progenies discussed.
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