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en.wikipedia.org/wiki/Beech_bark_disease

Beech bark disease is a disease that causes mortality and defects in beech trees in the eastern United States, Canada and Europe. In North America, the disease occurs after extensive bark invasion by the beech scale insect, Cryptococcus fagisuga.Through a presently unknown mechanism, excessive feeding by this insect causes two different fungi (Neonectria faginata (previously Nectria coccinea ...

www.toddsmariettatreeservices.com/tree-bark-splitting-can-i-fix-it

As the tree bloats, pressure builds against the hardened inner bark and may split the bark if that pressure becomes too high. Bark Splitting Treatment: As this condition typically occurs during the growth cycle of a tree, protecting the resulting wounds from insect infestation and disease is essential.

www.invasivespeciesinfo.gov/terrestrial/pathogens-and-diseases/beech-bark-disease

Major new tree disease epidemics: beech bark disease. Annual Review of Phytopathology 32:75-87. Kasson, M.T., and W.H. Livingston. 2009. Spatial distribution of Neonectria species associated with beech bark disease in northern Maine. Mycologia 101(2):190-195.

gardenerdy.com/birch-tree-diseases

Birch tree diseases include wet wood or slime flux that affects the core and the bark. The trees affected by this disease produce slime that oozes out, and this slime is consumed by insects. This disease is caused by certain types of bacteria. The condition can be identified by the presence of slime, and discoloration of the core and wood.

www.davey.com/.../tree-health-treatment/tree-insects-disease-management

Signs of pests and diseases will vary from tree to tree. One of the first visible signs will show on the leaves. Additional infestation symptoms will be visible on your tree bark, branches and twigs. Here are a few warning signs to help determine whether your trees and shrubs are struggling due to a tree pest or disease.

extension.colostate.edu/topic-areas/yard-garden/honeylocust-diseases-2-939

Root collar rot, a disease caused by soil microorganisms, kills the bark and outer wood on honeylocusts at the ground line, essentially girdling the tree by a canker. All ages and cultivars of honeylocust, including thornless and podless cultivars, are susceptible to cankers and collar rot.

arbordayblog.org/treecare/common-tree-pests-and-how-to-spot-them

The beetles transmit spores as they move from tree to tree, spreading disease. Trees with white or brown pitch tubes (small sap-like blobs) on the outside of the bark or conifers with reddish-brown needles spreading from the top of the tree down indicate a bark beetle problem. Sap-Sucking Insects Aphids

csfs.colostate.edu/forest-management/common-forest-insects-diseases/common...

Shade tree borers are insects that develop underneath the bark of trees and shrubs. Certain beetles and moths are the most common borers. Most shade tree borers can successfully attack only trees that are injured or stressed. Shade tree borer development takes from one to three years to complete. Adult stages of these insects occur outside the ...

www.gotreequotes.com/common-tree-diseases-and-their-treatments

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.

www.mortonarb.org/trees-plants/tree-and-plant-advice/help-diseases/canker-diseases

Canker diseases are common, widespread, and destructive to a wide range of trees and shrubs. Canker diseases frequently kill branches or structurally weaken a plant until the infected area breaks free, often in a wind or ice storm.