![]() ![]() However, decay cannot be reversed, and these measures are typically futile and negatively inhibit a tree’s natural sealing processes.Ī tree responds to wounds by compartmentalizing and forming suberized (cells take on a sealing function), lignified (strengthened) wood known as callus tissue that prevents entry of pathogens. For this reason, recommendations are often made to apply some sort of wound covering to help the tree recover. Decay results in discolored wood and structurally weakened and/or unattractive stems with shortened lives. Once the tree has been wounded, these organisms can enter heartwood and begin the process of decay. When a wound penetrates the bark and damages the cambium (a thin layer of vascular tissue responsible for water and nutrient movement within a tree), it also exposes the interior of the tree to damaging organisms such as fungi and bacteria. Tree wounds can also occur through intentional treatments like pruning, as well as natural processes such as storms, fires, and animal damage. These wounds can be caused by accidental contact with automobiles, construction equipment, or lawn equipment that damages the trunk or surface roots. Trees in urban and landscaping settings are more likely to receive wounds compared to trees in natural stands. Wounding along roots allows entry of damaging fungi, resulting in decay and future butt rot. This cherrybark oak was damaged by equipment. ![]()
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