Explanation should include
- wind
- water
- animal vectors
- poor sanitation
- propagation
- root grafting.
Process/Skill Questions:
- What factors help determine whether a tree will be infected with a disease?
- What are some ways that pathogens can be transmitted?
- How can the transmission of pathogens be reduced?
- What are some ways to reduce the risk of animal vectors?
- Which vectors are difficult to control under most urban forestry conditions?
- What sanitation concerns surround a forested area that could affect disease transmission?