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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. [1]
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.
Enterprise is a modern bred, late-ripening and attractive, red cultivar of domesticated apple with excellent fruit quality combined with disease resistance to scab, cedar apple rust, fire blight and some resistance to powdery mildew. The fruit is large and attractive and retains excellent fresh quality for up to six months at 1°C.
Its ancestry includes the 'Rome Beauty', 'Melba', 'Golden Delicious' and 'Wealthy' apples, as well as the Malus floribunda crabapple for scab resistance. "PRI" is impressed in the cultivars name "PRI"ma. [2] 'Prima' was originally very resistant to apple scab due to having the Vf gene. However scab has since evolved around that resistance, and ...
Apple scab: Venturia inaequalis Spilocaea pomi [anamorph] Apple ring rot and canker Botryosphaeria berengeriana = Physalospora. Armillaria root rot = shoestring root rot
In regions of apple production where the year's weather is conducive to infection up to 70% of the pesticides applied are used to control for the effects of apple scab. [9] While the main host of economic interest are various apple cultivars the other host species are still affected by the pathogen.
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.
Liberty is a hybrid apple cultivar developed by the New York State Agricultural Experiment Station. It was a seedling produced in 1955 from pollinating 'Macoun' from 'Purdue 54-12' for the sake of acquiring Malus floribunda disease resistances. It was first released to the public in 1978. [1]