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www.lawnstarter.com/blog/tree-care/oak-tree-diseases-treat-them

Treatment: The late onset of this disease means there is no significant damage, and therefore no treatment is required. If the issue is especially bad, a fungicide can be applied when the tree is dormant. Oak Wilt. Symptoms: Leaves at the top of the tree turn brown around the edges and wilt; damage progresses down the tree. Eventually, branches ...

www.elitetreecare.com/2016/07/identifying-tree-diseases

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.

www.thespruce.com/apple-tree-diseases-4588376

If you suspect your apple tree may be infested with a Phytophthora disease, perform the same sort of test you would to see if an arborvitae shrub (Thuja) is dead or alive. Take a sharp knife and remove a small strip of the outer bark of the trunk to check on the color underneath. Healthy wood is green here; diseased wood will be orange or brown.

www.treeremoval.com/common-tree-bark-diseases

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. ...

www.hunker.com/13429207/why-does-bark-on-maple-tree-turn-black

The fungus takes control of the tree when the tree suffers ongoing weakness brought on from maple tree decline. The fungal disease causes black fruiting structures to cover the tree's bark. The black pustules eventually grow together as the fungus spreads and forms a solid black layer over the bark's surface.

dengarden.com/landscaping/Maple-Tree-Problems

Threat Level: Severe (the fungus damages the tree's innards, and generally containing the disease means removing the tree) Sapstreak is a ground-living fungus that generally enters the tree's system via an injury near the roots or bottom portion of the tree. The fungus then inches upwards from the root system and infects the trunk of the tree.

www.hunker.com/13428772/why-are-there-no-acorns-on-my-oak-tree

Symptoms of oak tree diseases include discolored or spotted foliage, dead or dying foliage or branches, thinning canopy, shelf mushrooms or wet patches on the trunk. Although infections can lead to the death of a tree, one can treat them.

onetwotree.com/common-palm-tree-problems

An elusive, fatal palm disease that is incurable and unpreventable. The disease can only be identified by examining of the cross section of the trunk of the palm for a conch-like shape, the gradual process of wilting and a general decline in the appearance of the palm. It is not recommended to replace an infected palm with another palm. Wilting

extension.psu.edu/maple-diseases

Leafhoppers and spittle bugs carry the bacteria from tree to tree. Promote plant vigor by protecting the tree from stresses. Bleeding canker: Reddish-brown cankers develop in the inner bark of the main trunk and branches. The bark over the canker becomes sunken, and reddish-brown sap oozes out. Leaves wilt and branches die. Phytophthora cactorum

gardenerdy.com/common-diseases-in-aspen-trees-how-to-treat-them

The scales attach themselves to the tree bark or branch. They, like aphids, feed on the sap of the tree, and kill the tree over time. The scales have a brownish color which is very similar to the bark of the tree, and can easily be overlooked. Symptoms Upon infestation, there is a formation of folds in the affected limb of the tree.