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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.
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 ...
The tree is a free grower, but does not attain the largest size. Eating, cooking Bardsey Island Apple: Bardsey Island, Wales 1998 A medium-sized eating apple with a unique lemon aroma. Sweet and juicy. Skin color red over gold. Very disease resistant. Single tree discovered on Bardsey island in 1998, age of original tree unknown. May have ...
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.
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.
Apple scab is a common disease of plants in the rose family that is caused by the ascomycete fungus Venturia inaequalis. [1] While this disease affects several plant genera, including Sorbus, Cotoneaster, and Pyrus, it is most commonly associated with the infection of Malus trees, including species of flowering crabapple, as well as cultivated apple.
'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]
Malus coronaria often is a bushy shrub with rigid, contorted branches, but frequently becomes a small tree up to 10 metres (33 feet) tall, with a broad open crown. Its flowering time is about two weeks later than that of the domestic apple, and its fragrant fruit clings to the branches on clustered stems long after the leaves have fallen.