A tree’s health

A tree can live for several tens (or hundreds) of years if it is in good health.
However, even if it is still standing, a tree can be dead if its core is dead.
How can you tell if a tree is sick?
When a deciduous tree has yellow, brown or red leaves in the middle of the summer, compared to others which have green leaves, this can be a sign of sickness.
When a tree is dead, you can tell because it loses its bark, its leaves are the same colour as in the autumn, it can have holes or marks left by parasites such as the shot hole borer and it loses its leaves (or needles if it is a softwood tree).
Yet, dead trees aren’t problematic in the forest. Quite the opposite!
Clara and Candice