Top Signs Your Tree May Be Diseased or Dying
Trees don’t usually fail overnight. Most issues develop gradually, and the early warning signs can be easy to miss if you’re not actively looking for them. Catching problems early can help you decide whether a tree can be treated—or if removal is the safer option.
In Washington’s climate, where moisture and fungal activity are common, certain diseases can spread quickly if left unaddressed.
Changes in Leaves and Canopy
One of the first signs of a struggling tree is a noticeable change in its foliage. Leaves may become discolored, develop spots, or fall earlier than expected. You may also see sections of the canopy thinning or failing to produce new growth.
In the Pacific Northwest, conditions often promote diseases like anthracnose, which can cause blotchy leaves and premature leaf drop, especially during wet spring months.
Dead Branches and Progressive Dieback
Dead or brittle branches are a common indicator of decline. This often begins at the outer edges of the canopy and gradually works inward—a process known as dieback.
While a few dead branches can be normal, increasing dieback over time typically signals deeper issues affecting the tree’s health.
Fungal Growth and Internal Decay
Fungi growing on or around a tree are often a sign of internal decay. This can appear as mushrooms near the base or shelf-like growths along the trunk.
In Washington, root-related diseases—such as laminated root rot in conifers—are a major concern. These conditions weaken the tree from within, even if it still appears relatively healthy on the outside.
Bark Damage and Trunk Issues
The bark acts as a protective layer for the tree. When it becomes cracked, peeling, or begins to fall away in sections, it can expose the tree to further damage.
Look for:
-
Deep cracks or splits in the trunk
-
Areas of missing or loose bark
-
Darkened or oozing sections
These signs may indicate infection, decay, or structural weakness.
Slowed Growth and Overall Decline
A tree that isn’t growing as it once did may be under stress. This can show up as smaller leaves, reduced seasonal growth, or a thinning canopy compared to previous years.
In many cases, this type of decline is linked to root system issues, soil conditions, or long-term disease progression.
When to Take Action
Not every symptom means a tree is beyond saving, but multiple warning signs appearing together usually point to a more serious issue.
Early action can sometimes prevent further decline, especially if the problem is identified before structural damage occurs.
If you’re unsure about the condition of your tree, it’s always best to get a professional opinion. A proper evaluation can determine whether treatment is possible or if removal is the safest option.
Final Thoughts
Tree health issues often develop slowly, but they rarely resolve on their own. In Washington’s environment, where moisture can accelerate disease, staying proactive is key.
By paying attention to changes in your tree’s appearance and growth, you can make informed decisions that protect both your landscape and your property. If something doesn’t look right, having an expert take a look can provide clarity and peace of mind.