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The flowers on the tree may occur either single or in clusters of two to five flowers. They appear on the leaf axils on long, thin shoots. The flowers are small with four to five petals. The petals are cylindrical and are white to greenish in color. The flowers are hermaphroditic, meaning they are both sexes. The flowers open in the morning and ...
A. mali can still penetrate the stomates and hydathodes of leaves. [4] As with most pathogens, Alternaria mali resistance involves a gene-for-gene relationship. [4] 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.
Chondrostereum purpureum is a fungal plant pathogen which causes Silver leaf disease of trees. It attacks most species of the rose family Rosaceae, particularly the genus Prunus. The disease is progressive and often fatal. The common name is taken from the progressive silvering of leaves on affected branches.
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 ...
Viral diseases; Apple chlorotic leafspot genus Trichovirus, Apple chlorotic leafspot virus (ACLSV) Apple dwarf (Malus platycarpa) Apple stem pitting virus (ASPV) (? not US/CAN) Apple flat apple genus Nepovirus, Cherry rasp leaf virus (CRLV) Apple mosaic genus Ilarvirus, Apple mosaic virus (ApMV) genus Ilarvirus, Tulare apple mosaic virus (TAMV)
Botryosphaeria obtusa is a plant pathogen that causes frogeye leaf spot, black rot and cankers on many plant species. [1] On the leaf it is referred to as frogeye leaf spot; this phase typically affects tree and shrubs. In fruit such as the apple, cranberry and quince, it is referred to as black rot, and in twigs and trunks it causes cankers. [1]
Certain chemicals are used to treat leaf spot disease, such as the Bordeaux mixture, the first fungicide to have been developed, which treats many fungal and bacterial leaf spots. [7] Other fungicides such as zineb , chlorothalonil and Captan , also treat leaf spot disease and Benomyl specifically treats Cercospora leaf spots, cherry leaf spot ...
Pages in category "Apple tree diseases" The following 47 pages are in this category, out of 47 total. This list may not reflect recent changes. * List of apple ...