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2 Fungal diseases. 3 Nematodes, parasitic. 4 Viral diseases. 5 Viroid diseases. 6 Suspected viral- and viroid-like diseases. ... Viral diseases; Apple chlorotic leafspot
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.
Additionally, pruning and disposing of galls from infected cedar trees would reduce sources of inoculum for infection of apple trees, however this would likely be time consuming and uneconomical. [6] For those doing bonsai, it is common to have the trees within feet of each other and on the central eastern seaboard of the United States, eastern ...
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.
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 ...
The fungus does not cause serious damage to junipers, but apple and pear trees can suffer serious loss of fruit production due to the effects of the fungus. Although the genus has a worldwide distribution, its impact depends on availability of its two host plant species.
Apple scab is spread through fungus growing in old apple leaves on the ground and spreads during warm spring weather to infect the new year's growth. [61] Among the most serious disease problems is a bacterial disease called fireblight, and three fungal diseases: Gymnosporangium rust, black spot, [62] and bitter rot. [63]
Planting of less susceptible apple cultivars, horticultural practices that promote tree health and reduce fruit wetness hours, removal of overwintering diseased twigs and fruit, and fungicides Bitter rot of apple is a fungal disease of apple fruit that is caused by several species in the Colletotrichum acutatum and Colletotrichum ...