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Apple trees can recognize invading pathogens and mount a defense. [4] Often, the plant may be able to resist the pathogen, even though it has no genetic resistance to same. Apple trees seem to have a weak defense to A. mali , base on the fact that no survivors if leaves has been infected.
Interruption of the disease cycle is the only effective method for control of the cedar apple rust. Removing as many cedar trees within close proximity of an apple orchard will reduce potential sources of inoculum. The closer the tree to the orchard the greater impact removal will have. Removing all junipers within the 4–5 miles (6.5–8 km ...
The decline of apple and pear trees from their landscape can be expensive to replace and could have a negative effect on tourism. In the long-run, fire blight is a very important factor of economy and society. [citation needed] A relatively small number of apple cultivars are responsible for an enormous proportion of yearly apple production.
Viral diseases; Apple chlorotic leafspot genus Trichovirus, Apple chlorotic leafspot virus (ACLSV) Apple dwarf (Malus platycarpa)
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.
Sooty blotch and flyspeck (SBFS) or apple summer disease is a plant disease caused by a complex of saprophytic fungi which colonize the epicuticular wax layer of apple (Malus x domestica Borkh.). It is found worldwide in regions with moist growing seasons .
Apple trees are especially interesting as a research model in agriculture since it is known that apple production requires intensive spray schedules for control of pathogenic fungus V. inaequalis with as many as 15-22 sprays of fungicides per season in humid climate. [31] [32]
Marssonina blotch on a 'Rome' apple tree. Marssonina blotch was historically an important apple disease in Japan [3] and China. [5] In the 1990s it became an important apple disease in India, [6] and Korea. [7] Marssonina blotch was detected in Europe by the early 2000s [8] where it caused widespread disease, especially on organically managed ...