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Tree has good disease resistance to apple scab and powdery mildew. [6] The initiators of the PRI disease resistant apple breeding program have discovered that Malus floribunda has resistance to the apple scab and founded the program to introduce this VF gene into cultivated apples. Their work had been progressing with great success.
36 species and 4 hybrids are accepted. [2] The genus Malus is subdivided into eight sections (six, with two added in 2006 and 2008). [citation needed] The oldest fossils of the genus date to the Eocene (), which are leaves belonging to the species Malus collardii and Malus kingiensis from western North America (Idaho) and the Russian Far East (), respectively.
A separate project was initiated by C.S. Crandall of the University of Illinois to breed scab-resistant apples by introducing the VF gene from the crabapple Malus floribunda. His work has been continued by the PRI disease resistant apple breeding program with great success. [5] Among the scab-resistant apples that carry the VF gene are ...
Malus trilobata, the Lebanese wild apple, erect crab apple or three-lobed apple tree, is a species in the family Rosaceae in the genus Malus. [2] Some authorities place it in the segregate genus Eriolobus , as E. trilobatus .
Malus baccata is an Asian species of apple known by the common names Siberian crab apple, [2] Siberian crab, [3] Manchurian crab apple and Chinese crab apple. [ 4 ] [ 5 ] [ 6 ] It is native to many parts of Asia, but is also grown elsewhere as an ornamental tree and for rootstock .
Malus fusca is a deciduous tree growing up to 13 metres (43 feet) tall, with a trunk 20–25 centimetres (8–10 inches) thick. [2] The leaves are 5–8 cm (2–3 in) long, dark green above, and both pale and fibrous beneath; they turn bright orange to red in autumn. [2] The flowers are white or pale pink, blooming in spring.