Will these spots kill my tree?

Powdery mildew is rarely fatal, but it makes the tree look unsightly and can stunt growth. It is worth treating to keep the tree vigorous.

Can I wash the spots off?

You can wash them off with water, but the fungus will likely return unless you treat the underlying humidity or airflow issue.

Princess tree: spots, causes and fixes

Check these first

Rub the white spots to see if they wipe off like dust.
Check if the tree is crowded by other plants or structures.
Examine the leaves for signs of moisture buildup.

Likely causes

Powdery mildew
Most likely
How to tell: You will see a white, dusty coating on the surface of the leaves. It usually starts as small spots and spreads to cover the entire leaf.
What to do: Prune away heavily infected branches to improve airflow. Apply a fungicide labeled for powdery mildew every 7 to 14 days until the spots disappear.
Poor air circulation
Possible
How to tell: The tree is planted in a crowded area where the leaves stay damp for too long. The spots appear mostly on the inner, shaded parts of the canopy.
What to do: Thin out crowded branches to allow sunlight and air to reach the center of the tree. Avoid overhead watering that keeps the foliage wet for long periods.

Leaf spots on other plants

Find out what's wrong with your princess tree

The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

When to worry

If the mildew covers most of the leaves, it can hinder the tree's ability to make food. Treat it promptly to keep the tree healthy.

Stopping it coming back

Plant your Empress Tree in a spot with plenty of sun and space for air to move freely.

Princess tree: spots? Check yours with a photo

Every plant is a little different. Take a photo of your princess tree and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

Get the app · Or check it from a photo now, free

Questions people ask

Will these spots kill my tree?: Powdery mildew is rarely fatal, but it makes the tree look unsightly and can stunt growth. It is worth treating to keep the tree vigorous.
Can I wash the spots off?: You can wash them off with water, but the fungus will likely return unless you treat the underlying humidity or airflow issue.

Guides to these causes

Powdery Mildew

What are these white spots on my Empress Tree?