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Apple scar skin = apple dapple, apple sabi-ka, apple bumpy fruit ... Common Names of Diseases, The American Phytopathological Society This page was last edited on 23 ...
Apple trees are susceptible to many diseases, and because pruning involves leaving open wounds from branch cuts, it's best to do so when the trees are dormant, says Ferguson.
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.
In southern Germany apple and pear trees have been a part of the landscape for a long time, and are difficult to protect. The decline of apple and pear trees from their landscape can be expensive to replace and could have a negative effect on tourism. In the long-run, fire blight is a very important factor of economy and society. [citation needed]
Gymnosporangium juniperi-virginianae is a plant pathogen that causes cedar-apple rust. [1] In virtually any location where apples or crabapples and eastern red cedar (Juniperus virginiana) coexist, cedar apple rust can be a destructive or disfiguring disease on both the apples and cedars.
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. [clarification needed]
Furthermore, in plum trees, ApMV can cause line-pattern symptoms, while in roses, the symptoms are mosaic. [7] However, the most common host, the apple tree, tends to produce pale yellow irregular spots or bands along the major veins on the leaves as they expand in the spring. [1]
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