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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.
Viral diseases; Apple chlorotic leafspot genus Trichovirus, Apple chlorotic leafspot virus (ACLSV) Apple dwarf (Malus platycarpa)
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 coronaria often is a bushy shrub with rigid, contorted branches, but frequently becomes a small tree up to 10 metres (33 feet) tall, with a broad open crown. Its flowering time is about two weeks later than that of the domestic apple, and its fragrant fruit clings to the branches on clustered stems long after the leaves have fallen.
Malus hupehensis, common names Chinese crab apple, [3] Hupeh crab [4] or tea crabapple, is a species of flowering plant in the apple genus Malus of the family Rosaceae. [ 1 ] [ 5 ] It is native to China.
On the apple tree, the infections occur on leaves, fruit and young twigs. [4] The brightly colored spots produced on the leaves make it easy to identify. Small, yellow-orange spots appear on the upper surfaces of the leaves, anytime from April to June. [5] These spots gradually enlarge and turn orange or red and may show concentric rings of color.
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 .
Malus ioensis, known as the Iowa crab or prairie crabapple, is a species of crabapple tree native to the United States. The most common variety , M. ioensis var. ioensis , is found primarily in the prairie regions of the upper Mississippi Valley .