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Scentless Mayweed · Tripleurospermum inodorum

What are these spots on my Scentless Mayweed?

Spots on your plant are usually a sign of fungal trouble, especially if the weather has been damp. The most common culprit is powdery mildew, which looks like a dusting of flour.

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spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Check the undersides of the leaves for insects.
  2. Look for a white, dusty coating on the leaf surfaces.
  3. Notice if the spots appear after a rainy spell.

Likely causes

  1. Powdery Mildew

    Most likely

    How to tell: White, powdery patches appear on the leaves and stems. These spots can spread quickly during humid weather.

    What to do: Improve airflow around the plant by thinning out dense foliage. You can spray the leaves with a mixture of 1 teaspoon of baking soda in 1 quart of water to neutralize the fungus.

  2. Leaf Spot Disease

    Possible

    How to tell: Dark brown or black spots with yellow halos appear on the leaves. These often develop after prolonged periods of rain or overhead watering.

    What to do: Remove and dispose of any heavily infected leaves to stop the spread. Avoid watering from above and aim your hose at the base of the plant to keep the foliage dry.

Leaf spots on other plants

Find out what's wrong with your scentless mayweed

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.

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When to worry

Small, isolated spots are manageable, but if the entire plant is covered and leaves are dying, you need to act fast. It is normal to see some wear and tear on older leaves near the soil.

Stopping it coming back

Water at the base of the plant and ensure there is plenty of space between plants for air to circulate.

Scentless Mayweed: spots? Check yours with a photo

Every plant is a little different. Take a photo of your scentless mayweed 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.

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Questions people ask

Can I save a plant with powdery mildew?
Yes, if you catch it early. Improve the airflow and use a mild fungicide or baking soda spray to manage it.
Will these spots kill my plant?
If left untreated, severe fungal infections can weaken the plant significantly. However, they are rarely fatal if you address the humidity and airflow issues.

Guides to these causes

More problems with Scentless Mayweed

Back to the Scentless Mayweed guide

This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.