Is powdery mildew fatal?

It is rarely fatal if treated early, but it can weaken the plant and make it look unsightly.

Should I cut off affected leaves?

Yes, removing heavily infected leaves helps stop the spread of spores to healthy parts of the plant.

Marsh cudweed: spots, causes and fixes

Check these first

Rub the white spots to see if they wipe off.
Check if the plant is crowded by other pots.
Inspect the undersides of leaves for further growth.

Likely causes

Powdery mildew
Most likely
How to tell: A white, dusty coating appears on the leaves and stems, often during humid weather.
What to do: Improve air circulation around the plant by spacing it further from others. You can wipe the leaves with a mixture of one teaspoon of baking soda in a quart of water.
Water splashing
Possible
How to tell: Small, crusty white spots appear after watering, usually near the base of the plant.
What to do: Water the soil directly at the base rather than overhead. This keeps the foliage dry and prevents mineral buildup or fungal growth.

Leaf spots on other plants

Find out what's wrong with your marsh cudweed

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 spots cover most of the foliage and the leaves begin to yellow or curl, the infection is severe.

Stopping it coming back

Ensure good airflow and avoid getting water on the leaves when you irrigate.

Marsh cudweed: spots? Check yours with a photo

Every plant is a little different. Take a photo of your marsh cudweed 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

Is powdery mildew fatal?: It is rarely fatal if treated early, but it can weaken the plant and make it look unsightly.
Should I cut off affected leaves?: Yes, removing heavily infected leaves helps stop the spread of spores to healthy parts of the plant.

Guides to these causes

Powdery Mildew

Why are there white spots on my marsh cudweed?