A
conk is the external sign of wood rotting fungus. These
may appear as crusts or flat "hoof-shaped" brackets
(Figure 2) on stems and branches. Conks are a sign
of rot and an indication that the tree may have some serious
internal defects that will affect its longevity and could
result in the tree becoming a safety hazard. (Note: While
the presence of conks indicates the presence of rot, it
is possible that a tree will have serious rot without
conks being visible.)
Tree Problems
Tree
Rot and Cavities