Apple scab is a common disease of plants in the rose family (Rosaceae) that is caused by the ascomycete fungus Venturia inaequalis. 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. The first symptoms of this disease are found in the foliage, blossoms, and developing fruits of affected trees, which develop dark, irregularly-shaped lesions upon infection. Although apple scab rarely kills its host, infection typically leads to fruit deformation and premature leaf and fruit drop, which enhance the susceptibility of the host plant to abiotic stress and secondary infection. The reduction of fruit quality and yield may result in crop losses of up to 70%, posing a significant threat to the profitability of apple producers. To reduce scab-related yield losses, growers often combine preventive practices, including sanitation and resistance breeding, with reactive measures, such as targeted fungicide or biocontrol treatments, to prevent the incidence and spread of apple scab in their crops.
The Braeburn is a cultivar of apple that is firm to the touch with a red/orange vertical streaky appearance on a yellow/green background. Its color intensity varies with different growing conditions.
The Northern Spy, also called 'Spy' and 'King', is a cultivar of domesticated apple that originated in East Bloomfield, New York in about 1800. It is popular in upstate New York.
An apple is an edible fruit produced by an apple tree. Apple trees are cultivated worldwide and are the most widely grown species in the genus Malus. The tree originated in Central Asia, where its wild ancestor, Malus sieversii, is still found today. Apples have been grown for thousands of years in Asia and Europe and were brought to North America by European colonists. Apples have religious and mythological significance in many cultures, including Norse, Greek, and European Christian tradition.
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.
White Transparent is an early-season cultivar of apple which is usually used for cooking due to its sharp taste. It is sometimes said to be the same as 'Yellow Transparent', but 'Yellow Transparent' is sometimes described differently, with fine rather than coarse flesh, and a sub-acid rather than acid flavour.
Applecrabs are various hybrids between crabapples and apples. They are bred for varying reasons, including disease resistance and use in cold climates because they are often hardier than apple trees and their fruit has the good eating qualities of apples.
Rajka is a hybrid cultivar of domesticated apple from the Czech Republic, specifically for eating. Rajka was crossed and developed by the Institute of Experimental Botany from the Champion and Katka apples for scab resistance, hence possible to grow organic.
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. PRI stands for 'P'urdue, 'R'utgers and 'I'llinois.
'Akane' also known as 'Tokyo Rose', 'Tohoku No.3' and 'Prime Red' is a Japanese cultivar of domesticated apple, that according to Orange Pippin is one of the best early season apples.
'Alkmene' is a German cultivar of domesticated apple, also called 'Early Windsor'.
'Ariane' is a modern cultivar of domesticated apple that was recently developed in France for scab resistance.
'Delbard Jubilée' or 'Delgollune' is a modern French cultivar of domesticated apple which was developed in 1964 by Delbard nurseries. It is not the same as the Jubilee apple that was developed in Canada.
Golden Russet is an old American cultivar of domesticated apple which is excellent for fresh eating as well as for apple cider production. It is a russet apple and is therefore especially used as a cider apple. It is sometimes known as 'English Golden Russet', and has frequently been confused with 'English Russet'.
'Dorsett Golden' is a 'Golden Delicious'-like cultivar of domesticated apple and is descended from it, but is different with that it is early season, and most importantly, it needs a lower amount of cold weather to go into blooming, so it is possible to grow in warm climates.
Court Pendu Plat is an extremely old French cultivar of domesticated apple that was first recorded in 1613. The cultivar definitely dates back to earlier than the 17th century, and was probably cultivated by the Romans. It is known for its intense flavor which mellows with storage.
Flamenco, also known as Ballerina Obelisk, is a cultivar of domesticated apple that bears apples good for eating fresh, and is grown for its unusual ornamental properties. The tree grows in a straight up columnar style, with many small fruit-bearing branches. 'Flamenco' is one of a series of apple tree cultivars that share a registered trademark under the name Ballerina.
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 moderate acidity at time of harvest mellows in storage, and it is best after one month of storage.
The 'Prima' apple is one of the modern disease resistant cultivars of domesticated apple which was bred by the PRI disease resistant apple breeding program in 1958. The disease resistance against apple scab has since been broken.
Aia Ilu is a cultivar of domesticated apple, from Estonia, first developed in 1946 by Aleksander Siimon.
Indiana, United States in 1994
