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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.
Malus floribunda, common name Japanese flowering crabapple, [1] [2] Japanese crab, [3] purple chokeberry, [2] or showy crabapple, [2] originates from Japan and East Asia. It may be a hybrid of M. toringo with M. baccata , in which case it would be written as Malus × floribunda .
These spores rise into the air and land on the surface of a susceptible tree, where they germinate and form a germ tube that can directly penetrate the plant's waxy cuticle. A fungal mycelium forms between the cuticle and underlying epidermal tissue, developing asexually the conidia , that germinate on fresh areas of the host tree, which in ...
Malus sieboldii, commonly called Siebold's crab, [1] Siebold's crabapple or ... Fungal plant pathogen Pseudocercospora mali is found on the leaves of the tree in ...
Malus florentina is a species of apple known by the common names Florentine crabapple and hawthorn-leaf crabapple. It is native to the Balkan Peninsula and Italy , and it is grown elsewhere as an ornamental tree .
36 species and 4 hybrids are accepted. [2] The genus Malus is subdivided into eight sections (six, with two added in 2006 and 2008). [citation needed] The oldest fossils of the genus date to the Eocene (), which are leaves belonging to the species Malus collardii and Malus kingiensis from western North America (Idaho) and the Russian Far East (), respectively.
Malus trilobata, the Lebanese wild apple, erect crab apple or three-lobed apple tree, is a species in the family Rosaceae in the genus Malus. [2] Some authorities place it in the segregate genus Eriolobus , as E. trilobatus .
Malus baccata is an Asian species of apple known by the common names Siberian crab apple, [2] Siberian crab, [3] Manchurian crab apple and Chinese crab apple. [ 4 ] [ 5 ] [ 6 ] It is native to many parts of Asia, but is also grown elsewhere as an ornamental tree and for rootstock .
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