Key Takeaways
- Look for visible decay, large dead limbs, fungal growth, major lean, or root failure—these are top removal indicators.
- Some problems can be managed with pruning or treatment; internal decay, severe root damage, and structural failure usually require removal.
- Do safe, non-invasive checks yourself, but call a professional when a tree threatens structures, power lines, or shows active failure.
- Never climb or cut large hazardous limbs yourself—use PPE and hire an insured arborist for risky work.
Common Symptoms
- Large sections of dead crown or persistent dieback
- Fungal fruiting bodies (mushrooms or conks) at the base or on roots
- Leaning tree that wasn’t leaning before or recent tilt after storms
- Deep trunk cracks, cavities, or hollow-sounding wood
- Root damage, soil heaving, or exposed roots near the foundation or sidewalk
- Repeated branch failure or splitting trunk
- Pest infestations causing canopy thinning (bark beetles, borers)
- Significant root girdling from improper planting
Possible Causes & Solutions
Decay and Internal Rot
How to Identify: Look for mushrooms or conks at the base, soft or crumbly wood around wounds, hollow-sounding trunk when tapped, and cavities visible in the trunk. Repeated branch failure above a visible decay zone is another clue.
Solution: Small, localized decay may be managed with pruning and monitoring, but extensive internal rot compromises structural integrity—removal is usually safest. Avoid cutting into decayed wood; clear safety zone beneath and erect barriers if needed until a pro assesses.
DIY: No - Professional recommended
Large Dead Crown or Extensive Dead Branches
How to Identify: Widespread dead branches, especially in the upper crown, lack buds or green leaves in season. Bark may be loose or missing on large limbs.
Solution: If dead wood is limited, prune the dead branches back to sound wood in late winter or dormant season. If more than 30-40% of the canopy is dead or the main leader is dead, removal is recommended.
DIY: Yes
Root Failure or Severe Root Damage
How to Identify: Check for soil heaving, cracked or lifted pavement, exposed roots, lean starting near the base, or roots severed by construction. Mushrooms near roots indicate root decay.
Solution: Minor root damage can sometimes be mitigated by improving soil health and avoiding further disturbance. Significant root failure or compromised anchorage requires professional removal—do not attempt to stabilize a large leaning tree yourself.
DIY: No - Professional recommended
Structural Defects (Cracks, Co-Dominant Stems, Trunk Splits)
How to Identify: Large splits, visible cracks, or two stems with a narrow V-crotch and bark inclusion indicate weak structure. Audible cracks or fresh wood exposure after wind events are urgent signs.
Solution: Small defects may be addressed by an arborist with cabling or targeted pruning to reduce weight. Severe splitting, deep cracks, or a failing trunk often necessitate removal.
DIY: No - Professional recommended
Pest or Disease Infestation
How to Identify: Look for wood-boring exit holes, sawdust-like frass, epicormic sprouts, rapid canopy thinning, or discolored foliage. Specific pests (e.g., emerald ash borer) may show species-specific symptoms.
Solution: Early infestations can be treated with targeted insecticides or cultural controls by a certified arborist. Extensive infestation with major structural decline often requires removal to prevent spread.
DIY: Yes
Storm or Impact Damage
How to Identify: Uprooted or partially uprooted trees, split trunks, or large limbs torn off. Recent storm damage with instability at the root plate or trunk indicates imminent failure.
Solution: Immediate professional assessment is recommended. Temporary bracing is not a long-term fix for major structural damage—removal is often safest for heavily damaged trees.
DIY: No - Professional recommended
When to Call a Professional
Call a professional arborist immediately if the tree presents an imminent risk to life, property, or utilities—examples include trees leaning toward buildings, audible cracking sounds, large fungal growth at the base, or root plate exposure after a storm. A certified arborist can perform an on-site assessment, use climbing or aerial tools safely, and recommend removal or mitigation. For non-emergency but concerning issues—such as significant canopy dieback, suspected internal decay, or pest outbreaks—schedule an inspection. Professionals can offer risk ratings, targeted treatments, pruning plans, or safe removal estimates. Always hire insured, licensed tree removal services for hazardous or large-tree work and get multiple quotes if removal isn't urgent.
Frequently Asked Questions
How can I tell if a tree is dead or just dormant?
Check during the growing season: living trees show flexible small twigs with green inner bark and buds. Scratch test a small twig—green underneath indicates life. Dead trees have brittle twigs that snap easily and lack green tissue. In late winter/dormant season, look for leaf buds and follow canopy patterns; persistent canopy death through season suggests the tree is dead or dying.
Can I remove a hazardous tree myself?
Removing small trees and low-risk limbs may be DIY if you have the right tools and experience, but large or hazardous trees require professional equipment and training. Climbing, cutting large limbs, or working near power lines is dangerous. Hire an insured arborist for trees over 15–20 feet, any tree near structures or utilities, or when the work requires complex rigging.
Will pruning save a tree with decay or disease?
Pruning can remove deadwood and reduce weight to lower failure risk, and targeted cuts can improve airflow to slow disease spread. However, extensive internal decay, large cavities, or progressive disease often cannot be resolved by pruning alone. An arborist can determine if pruning plus monitoring is sufficient or if removal is the safer, long-term solution.
Are mushrooms at the base a guaranteed sign the tree must be removed?
Fungal fruiting bodies at the base indicate wood decay fungi active in the roots or trunk and are a serious warning. While not always an immediate removal order, their presence increases the likelihood of structural failure. A professional inspection is recommended to determine decay extent and the level of risk to nearby structures.
How quickly should a leaning tree be addressed?
Any recent tilt, especially after storms or root disturbance, should be evaluated promptly. A slowly leaning tree that developed over many years may be stable, but a sudden lean typically signals root or trunk failure and needs immediate assessment. If the lean risks structures or people, do not delay contacting a professional.