Identification should include
- abnormal swelling
- cankers
- dieback
- stunted leaves
- flagging
- discoloration
- fungal fruiting bodies
- rot.
Process/Skill Questions:
- What are some signs and symptoms of tree diseases?
- How can symptoms be used to identify diseases?
- What are the causes of Dutch elm disease?
- How does the American forest industry address widespread disease, such as Dutch elm disease and others?