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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 'Evereste' crabapple flowers in spring, [5] producing a large number of flowers. [6] The flowers are 5 cm (2 in) in width. [4] When the flowers are buds the petals are red, but when the flowers open the petals are white with a pink tint. [4] [5] [6] The 'Evereste' fruit reaches up to 2.5 cm (1 in) in length.
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.
The PRI disease resistant apple breeding program is a joint project of the Purdue University, Rutgers University, and the University of Illinois, to breed apple cultivars to be resistant to apple scab. The initialism stands for the three involved universities: Purdue, Rutgers and Illinois.
Malus (/ ˈ m eɪ l ə s / [3] or / ˈ m æ l ə s /) is a genus of about 32–57 species [4] of small deciduous trees or shrubs in the family Rosaceae, including the domesticated orchard apple, crab apples (sometimes known in North America as crabapples) and wild apples.
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.
This for modern disease resistant apple that were bred and developed by the PRI disease resistant apple breeding program, usually including the vf gene of Malus floribunda for apple scab resistance. They would have the letters "PRI" in their name.
Malus hupehensis, common names Chinese crab apple, [3] Hupeh crab [4] or tea crabapple, is a species of flowering plant in the apple genus Malus of the family Rosaceae. [ 1 ] [ 5 ] It is native to China.