What is localized dead tissue, often shrunken and discolored called?

The term for localized dead tissue that is often shrunken and discolored is known as a canker. Cankers are typically the result of infection by pathogens, such as fungi or bacteria, which impede the plant's natural processes, leading to the death of plant tissue in a specific area. The appearance of cankers can vary, but they commonly manifest as sunken, discolored spots on the bark or stems of trees and shrubs.

In addition, the development of a canker can lead to further complications for the plant, including decreased vigor, increased susceptibility to other diseases, and potential structural problems. Understanding the characteristics of cankers is essential for proper diagnosis and management in arboriculture and plant health care.