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A gene conditioning the 3-type resistance reaction to Venturia inaequalis Cke. (Wint.), recovered from M. micromalus Mak., is shown to be carried at the V f locus, and thus allelic with similar genes recovered from 10 other Malus species and forms. Malus micromalus and M. atrosanguinea (Spaeth) Schneid. 804 are shown to carry allelic genes conditioning the pit-type of resistant reaction. The symbol V m is assigned to this locus.
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Dayton et al. (1970) studied this question.
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