Abstract
Evaluation of progeny resulting from controlled crosses and selfs of various plum (Prunus salicina and hybrids) cultivars revealed that resistance to black knot Apisporina morbosa (Schw.) is controlled by a single recessive gene (proposed designation bk) in the resistant cultivars studied. `Bruce', `Munson', `Crimson', and `Ozark Premier' were homozygous resistant (bkbk), while `Methley' was susceptible and heterozygous (Bkbk) for the trait.
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