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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.
'Evereste' is a small deciduous tree [4] that grows to a height of 7 m (22 ft), and spread of 6 m (20 ft). [5] The tree is conical in shape and has somewhat lobed, elliptical leaves. Flowering. The 'Evereste' crabapple flowers in spring, [5] producing a large number of flowers. [6] The flowers are 5 cm (2 in) in width. [4]
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.
Along with being DED-resistant, ‘Frontier’ is also highly tolerant of elm yellows disease, another nemesis of elm trees. It rarely flowers so it is virtually seedless. Height: 25 feet. Width ...
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 .
The tree is winter-hardy and drought-resistant, growing 5–8 m (16–26 ft) tall in the wild (<5 m under cultivation), with a globular crown and very dark purplish-brown bark. [citation needed] New shoots are dark purple, and leaves range from purplish when new to dark green when mature. In the spring it puts out intensely magenta-rose flowers.
Macromeles tschonoskii is a strong-growing deciduous tree, it has a distinctive columnar habit and is particularly noted for its autumn colouring, when the glossy mid-green leaves turn to brilliant shades of yellow, orange, purple and scarlet.
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