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As evident by the name, Ash Dieback is typically a disease that is common with Ash trees. It is caused by a fungal infection that goes by the name of Chalara Fraxinea, or C. Fraxinea for short. This disease primarily causes the tree to shed its leaves, with visible lesions in the stem that look a burn, and crown dieback.


Common Tree Bark Diseases . One of the most common and serious types of disease on trees is tree cankers. These are areas of bark that have died on the trunks or branches of trees. There are several things that could cause the death of the bark in a particular area, such as physical damage caused by impact, bacteria, or fungi. ...


Bark and Trunk Diseases. Beech Bark Disease affects beech trees and is caused by the combination of a beech scale insect’s feeding habits and an opportunistic fungal pathogen. An early sign of beech bark disease is a visible infection on the tree’s bark that looks like a reddish-brown, oozing, bleeding wound. (Yuck!)

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Disease spread is by root grafts, insects and occasionally squirrels. Leaves develop chlorotic (yellow) veins that eventually turn necrotic (brown and dead). Defoliation may be rapid. The tree canopy becomes thin and no new leaves emerge. Symptoms appear in spring or summer. Peeled bark or a cut branch from an infected tree may show a


CYTOSPORA CANKER. Cytospora canker, caused by the fungus Cytospora kunzei (also known as Valsa kunzei var. piceae), is the most prevalent and destructive fungal disease of Norway and Colorado blue spruce.Occasionally, Cytospora canker is found on Douglas-fir, hemlock, and larch. Susceptibility varies widely among species, but generally trees under stress or growing outside their natural range ...


However, other tree problems may also result in dieback. Subsequently, the outer bark begins to slough off in areas of infection, and pieces of bark can be seen at the base of the tree. This bark loss exposes the first sign of the fungus, which is a brownish fungal stroma where conidia (or asexual spores) of the pathogen are produced.


The disease begins in bark layers, then extends into inner wood and often leaves oozing, wet areas on the bark. The cankers provide entry points for insects or other diseases and weaken the tree. In some cases, the canker-stricken areas can be cut out, but this is best done by an arborist.


3. Peeling Bark. Another sign that your tree has a disease is peeling bark. The bark on your tree is important, as it protects the inner core of the trunk and keeps the tree healthy. If the bark on your trees starts to peel, the trees may not maintain necessary nutrients and could die.


Several cankers form on the bark of sweet gum trees resulting in lesions that may become sunken with roughened bark that peels from the tree. Botryosphaeria canker may cause branch dieback, cosmetic damage and even the death of the tree. Keep your tree vigorous, as healthy trees are resistant to canker disease.


Canker Diseases: Canker Diseases are caused by fungi that commonly enter the tree through wounds in the bark or branch stubs. Improper pruning can increase your risk of cankers. Thousands Canker Disease: Originally confined to the western parts of the United States, Thousands Canker Diseases, made it to Fairfax County in 2012.