Native insects and diseases are a natural part of the forest. Every tree species has insects and diseases that attack it, particularly when a tree is stressed by drought or other factors. However, sometimes these organisms damage more trees than we can accept, especially if we have unintentionally created a favorable environment for them (by allowing forests to become too dense or heavily composed of less-adapted tree species).
Topics addressed in this chapter:
•defoliators
•stem decays
•white pine blister rust
•root diseases
•witches brooms
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