Topic summary
Forest Decline
Extracted from the Wikipedia article Forest dieback.
Definition
Forest dieback presents itself in many ways: falling off of leaves and needles, discolouration of leaves and needles, thinning of the crowns of trees, dead stands of trees of a certain age, and changes in the roots of the trees. It also has many dynamic forms. A stand of trees can exhibit mild symptoms, extreme symptoms, or even death. Forest decline can be viewed as the result of continued, widespread, and severe dieback of multiple species in a forest. Current forest decline can be defined by: rapid development on individual trees, occurrence in different forest types, occurrence over a long duration (over 10 years), and occurrence throughout the natural range of affected species.