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To get rid of fungus on a dogwood tree, you’ll need to combine proper pruning, good sanitation, and sometimes a targeted fungicide treatment.
Fungus on dogwood trees is a common sight, especially in spring when the weather is cool and wet.
If you’ve noticed white patches, leaf spots, or dying branches, you’re likely dealing with one of several fungal diseases that love to attack these beautiful ornamentals.
The good news is that you can absolutely get rid of fungus on dogwood trees with a consistent plan, and it all starts with understanding what you’re up against.
In this post, we’ll walk you through the most effective ways to eliminate fungus on a dogwood tree, how to prevent it from coming back, and the best treatments for different types of fungal infections.
Let’s dig in and get your dogwood healthy again.
Why Fungus on Dogwood Trees Happens
Fungus on dogwood trees happens because the conditions are just right for spores to land, germinate, and spread.
Dogwoods are woodland understory trees by nature, so they prefer dappled light and good air circulation.
When they’re planted in full shade, crowded spots, or areas with poor airflow, moisture lingers on the leaves and bark.
And where moisture lingers, fungal spores find a perfect home.
Here are the main reasons you end up with fungus on a dogwood tree:
1. High Humidity and Wet Leaves
Dogwood trees thrive in moderate moisture, but too much is a problem.
When leaves stay wet for extended periods, especially overnight, fungal spores on the leaf surface germinate quickly.
This is why fungus on dogwood trees often shows up after a rainy spring or during humid summer months.
The longer the leaves stay wet, the more likely the fungus will take hold and spread across the canopy.
2. Overhead Watering
Sprinklers that spray water up onto the leaves can be a major culprit.
Each time you water from above, you’re essentially giving the fungus a fresh drink and helping it multiply.
To get rid of fungus on dogwood trees, switch to soaker hoses or drip irrigation at the base of the tree.
This keeps the foliage dry and cuts off the fungus’s water supply.
3. Wounds and Cracks in the Bark
Dogwoods often get small wounds from pruning, lawn mowers, or weather damage.
These open areas are like doors for fungal spores to enter the tree’s vascular system.
Once inside, the fungus can cause cankers, dieback, and even kill the whole branch.
Keeping the tree free of mechanical damage is a key step in preventing fungus on dogwood trees.
4. Fallen Leaves and Debris
Infected leaves that fall to the ground are full of fungal spores.
If you leave them there, rain will splash the spores back up onto your tree.
Cleaning up fallen debris every autumn is an essential part of breaking the fungal life cycle.
Don’t compost infected leaves, either, because the spores can survive and reinfect your dogwood next year.
How to Get Rid of Fungus on Dogwood Trees
Now let’s get into the actual step-by-step process to get rid of fungus on dogwood trees, no matter which type you’re facing.
Here’s the complete treatment plan for getting rid of fungus on a dogwood tree:
1. Identify the Specific Fungus First
Before you spray anything, figure out what you’re dealing with because different fungi need different treatments.
The most common fungal issues on dogwoods are powdery mildew, anthracnose, and spot anthracnose.
Powdery mildew looks like a white dusty coating on leaves, while anthracnose causes tan spots with purple borders and can kill branches.
Spot anthracnose shows up as small, round purple spots on the bracts and leaves in spring.
Knowing the exact fungus on your dogwood tree will tell you which fungicide to use and when to apply it.
2. Prune Out Infected Branches Immediately
Once you spot fungus on dogwood tree branches or leaves, get your pruning shears out right away.
Cut off all infected branches at least six inches below the visible damage.
Make clean cuts at a slight angle, just above a bud or a branch collar.
Sterilize your pruning tools with rubbing alcohol between every single cut.
This prevents you from accidentally spreading the fungus to healthy parts of the tree.
Proper pruning improves air circulation, which dries out the leaves faster and makes it harder for fungus to thrive.
3. Apply a Targeted Fungicide at the Right Time
For leaf spot diseases like anthracnose, a protective fungicide can work wonders.
Look for products containing chlorothalonil, myclobutanil, or copper-based compounds.
Apply the fungicide just as the buds begin to swell in early spring for the best results.
Then reapply every 10 to 14 days until the new leaves have fully expanded.
For powdery mildew, use a sulfur-based fungicide or a horticultural oil, and make sure you cover both the tops and undersides of the leaves.
This is the most direct way to get rid of fungus on dogwood trees with chemicals, though prevention is still your best friend.
4. Rake and Remove All Infected Leaves
Get rid of fungus on dogwood trees by removing every infected leaf that has dropped.
Rake the area around the tree thoroughly, and then bag up those leaves and throw them in the trash.
Do not add them to your compost pile because the heat may not kill the spores.
After raking, you can also apply a fresh layer of mulch around the base of the tree.
But keep the mulch a few inches away from the trunk to prevent moisture buildup against the bark.
5. Improve Air Circulation and Sunlight
If your dogwood is surrounded by dense shrubs or low-hanging branches, thin them out.
Removing competing growth opens up the canopy and lets sunlight penetrate through.
Sunlight dries the leaves quickly and reduces the time spores have to infect.
You might also consider pruning up the lower branches of your dogwood to create better airflow near the ground.
Combining these cultural changes with pruning is how you permanently get rid of fungus on dogwood trees.
Preventing Fungus on Dogwood Trees for Good
Once you get rid of fungus on dogwood trees, you don’t want it coming back next season.
Prevention is always easier than treatment, and it starts with good tree care habits.
The single most important thing is keeping the foliage as dry as possible.
Water deeply at the base of the tree, preferably in the morning so any moisture evaporates during the day.
Fertilize your dogwood in early spring with a balanced, slow-release fertilizer to keep it strong and resistant to fungal infections.
Avoid high-nitrogen fertilizers because they create soft, succulent growth that fungus loves to attack.
Finally, do a thorough inspection each spring and treat any early signs of fungus on dogwood trees before they get out of hand.
So, How Do You Get Rid of Fungus on a Dogwood Tree?
You can get rid of fungus on a dogwood tree by combining pruning, sanitation, and targeted fungicide applications.
Start by identifying the type of fungus, then prune out all infected branches and rake up every fallen leaf.
Improve the tree’s growing conditions by increasing airflow and watering only at the root zone.
If the infection is severe, apply the right fungicide at bud break and continue through early summer.
With a consistent approach, your dogwood will bounce back and thrive for years to come.