Symptoms
Leaf Spots
Leaf spots can range from a mild cosmetic issue to a sign of recurring disease pressure. Learn the common causes of spotted foliage, what to watch for, and when it is wise to bring in an ISA Certified Arborist.
ISA Certified Arborists
Trained, credentialed experts
Southeast Michigan
Specialists who know local trees
Dedicated Tree Specialists
Not a lawn care add-on
Professional Consultations
Custom care plan, no pressure
On this page
What is it?
Signs & symptoms
What causes it
Trees affected
When to act
How we help
Prevention tips
FAQs
Spotted these symptoms?
An ISA Certified Arborist can confirm what's going on with your tree.
or call 248.378.1111
Overview
What Leaf Spots May Mean
Leaf spots are a common symptom on many trees and shrubs in Michigan landscapes. Small spots, blotches, or lesions on foliage may look minor at first, but they can point to fungal disease, bacterial issues, insect activity, or environmental stress.
Some spotting is mostly cosmetic. In other cases, it may lead to premature leaf drop, repeated stress, and reduced vigor over time if the issue is left unaddressed.
When you'll see it in Michigan
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Overview
Common Signs & Symptoms
Check each one you're seeing on your tree — your match strength updates below.
Root Cause
Possible Causes
Leaf spots are often associated with fungal diseases, though bacterial issues, insect damage, and weather stress can also create spotting or blemishes on foliage.
- Fungal or bacterial issues
- Insect damage
- Weather stress
- Excessive wetness
- Poor air circulation
Wet spring conditions, poor air circulation, repeated leaf wetness, and susceptible plant varieties can all increase the likelihood of spotting problems.
Plants at Risk
Trees & Shrubs Commonly Affected
Leaf spots commonly show up on crabapple, maple, dogwood, ornamental trees, and a variety of shrubs. The color, size, and pattern of the spots can help point toward the likely cause.
Ornamental
Red Flags
When to Be Concerned
A few isolated spots are not always a major concern. But if spotting is widespread, comes back year after year, or is leading to noticeable leaf drop, it is worth evaluating.
Repeated defoliation can stress a plant over time, especially when other site or weather factors are also involved.
Our Approach
How My Arborist helps
My Arborist looks at the pattern of spotting, plant type, site conditions, and seasonal timing to help determine what is most likely causing the issue. From there, our ISA Certified Arborists can recommend the most appropriate management plan.
01
Disease-focused evaluations
Tree and shrub health evaluations
02
Targeted Treatment
Recommendations when appropriate
03
Care recommendations
Cultural care recommendations to reduce leaf wetness and stress
04
Future Monitoring
Monitoring recurring issues over time
05
Support
Supportive care to help maintain long-term plant health
Stay Ahead
Prevention & Monitoring Tips
Monitor spotting early in the season before it spreads
Reduce stress on the plant through proper watering and care
Avoid practices that keep foliage wet longer than necessary
Remove heavily infected leaf litter when appropriate
Stay ahead of recurring disease pressure with proactive evaluations
Common Questions
Frequently Asked Questions
What causes black or brown spots on leaves?
Leaf spots are often caused by fungal disease, bacterial issues, insect damage, and stress can also create spotted foliage.
Are leaf spots serious?
Sometimes they are mostly cosmetic, but repeated spotting and early leaf drop can weaken a plant over time, especially if the problem returns each year.
Can leaf spots spread to other plants?
Some diseases can spread under the right conditions, particularly during wet periods. That is one reason early identification matters.
When should I schedule an evaluation?
If leaf spots are widespread, recurring, or paired with early leaf drop or thinning, an evaluation can help determine whether treatment or monitoring is the better next step.
Keep Exploring
Other symptoms
Branch Dieback
Thinning canopy sections
Holes in Leaves
Insect, disease, or other damage.
Yellowing Leaves
Sign plant is under stress
CONSULTATION
Not sure what you’re seeing?
If your tree or shrub is showing signs of stress, discoloration, spotting, or decline, My Arborist can help identify the likely cause and recommend the right next step for your landscape.
ISA Certified Arborists
Each visit is handled by credentialed professionals
No-Pressure Consultation
Professional assessment, custom plan, honest recommendations
Serving SE Michigan
Plymouth, Northville, Birmingham, Novi & more
Contact us below
or give us a call at 248-378-1111