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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.
An apple is a round, edible fruit produced by an apple tree (Malus spp., among them the domestic or orchard apple; Malus domestica). 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.
The growth cycle of M. sieversii could be divided into several stages from germination to developing fruit bearing trees, and to the death of aged trees. [7] Period I starts from seed germination to the development of vegetative tree parts, and to the first round of fruiting. [7] A typical apple tree reaches age 6 to 8 in this period.
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The wild apple is a deciduous small to medium-sized tree, but can also grow into a multi-stemmed bush. It can live 80–100 years and grow up to 14 metres (46 feet) tall with trunk diameters of usually 23–45 centimetres (9– 17 + 1 ⁄ 2 inches), although diameters exceeding 90 cm (35 in) have been recorded. [ 2 ]
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An open-centred crown on a short trunk of less than 1 metre (3 ft 3 in). This is a traditional and popular form for apple trees. Bush trees are easy to maintain and bear fruit at a young age. Final height is between 2 metres (6 ft 7 in) and 5.5 metres (18 ft), depending on which rootstock is used. [1]
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