Diseased Trees Case Study
Trees are at more risk when a failure of one or more of their parts results in property damage and personal injury. All trees have the potential to fail. ISA Certified Arborists evaluate individual trees, assesses their potential to fail, and recommend appropriate action. Trees can develop diseases, tree blight, broken or cracked limbs, and heavy limbs that could fall. Learn more here about what to look for and how an ISA Certified Arborist can help prevent or treat tree care disease.
Signs of a Sick Tree
- Man-made Wounds
- Insect Damage
- Dead Wood
- Dead Branches
- Wilted or Discolored Leaves
- Mushrooms or Fungi Growing at the Base of Tree
- Root Problems
- Conks or Cankers
- Sawdust at the Base or Root Zone of the Tree
- Hollow or Decayed Areas in the Tree
- Cracks in the Trunk or Major Limbs
- Co-dominant Stems with Included Bark
- Weak Branch Unions
- Poor Tree Architecture
Trees add to our enjoyment of outdoor experiences, whether it is in forests, parks, or urban landscapes. Yet, too often, we are unaware of the risks associated with defective trees, which can cause personal injury and property damage. Interest in tree management has increased in recent years due to safety and liability concerns resulting from preventable accidents. Recognizing risks in trees and taking proper corrective actions can protect property and save lives. A “hazard tree” is a tree with structural defects likely to cause the failure of all or part of the tree, which could strike a “target.” A target can be a vehicle, building, or a place where people gather, such as a park bench, picnic table, street, or backyard. We recommend that professional ISA Certified Arborists undertake corrective actions. Because of the natural variability of trees, the severity of their defects, and the different sites upon which they grow, it can be a complex process to evaluate trees for hazardous defects. This publication presents guidelines, not absolute rules, for recognizing and correcting hazardous defects. When in doubt, consult an ISA Board Certified Master Arborist.
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