The Intersection of Disease and Tree Risk Assessment
A professional evaluation naturally includes an assessment of common diseases. Many pathogens, such as Ganoderma or Armillaria, specifically target the structural components of a tree like the roots and the lower trunk. During a tree risk assessment, the arborist looks for signs of these diseases because they are often the root cause of why a tree becomes a hazard in the first place.
Identifying Fungal Pathogens
Fungi are the most common cause of internal wood decay. When an arborist identifies a "fruiting body" or mushroom on a tree, they aren't just looking at the fungus; they are diagnosing a disease. Different types of fungi rot wood at different speeds. Identifying the specific disease allows the expert to predict how quickly the tree will lose its strength and how urgent the safety risk actually is.
Distinguishing Between Health and Structure
It is important to note that a "sick" tree isn't always a "dangerous" tree, and a "healthy-looking" tree can be a major risk. A tree with leaf spots or a minor insect infestation might look bad but pose no risk of falling. Conversely, a tree with vibrant green leaves could have a root disease that makes it highly unstable. An assessment balances these biological and mechanical factors.
Diagnostic Testing for Tree Diseases
If the arborist suspects a specific disease but cannot confirm it visually, they may take samples. This could involve collecting leaves, soil, or bark to be sent to a plant pathology lab. This diagnostic step is crucial for determining if a disease can be treated with fungicides or if the infection has already progressed too far to save the tree safely.
Pests as a Risk Factor
Insects can also contribute to tree failure. For example, wood-boring beetles create tunnels that weaken the internal structure of branches. While a safety assessment isn't a dedicated "pest control" visit, the arborist will identify these infestations as part of the overall risk profile, as pest damage often invites secondary fungal infections that further degrade the wood.
Customized Treatment Plans
If a disease is caught early during the risk evaluation, the arborist can recommend a treatment plan to restore the tree's health. This might include specialized fertilization, trunk injections, or soil amendments. By treating the disease, you are effectively "treating" the risk, ensuring the tree remains a strong and stable part of your landscape for years to come.
Conclusion
While the primary focus is safety, disease diagnosis is an inseparable part of any professional tree evaluation. Understanding the biological threats to your trees allows for a more accurate risk profile and opens the door to life-saving treatments. By addressing both health and structure, you ensure a holistic approach to care that prioritizes the longevity and safety of your entire outdoor environment.