Pocket Botanist
Check these first
- Inspect the undersides of the leaves for orange dust.
- Check if the plant is crowded by other vegetation.
- Feel the soil to see if it stays wet for too long.
Likely causes
Rust fungus
Most likelyHow to tell: You will see small orange or brown pustules on the underside of the leaves. These spots often leave a rusty residue if you rub them.
What to do: Trim off the most heavily affected leaves to stop the spread. Improve air circulation around the plant by moving it to a spot with a light breeze. Avoid overhead watering to keep the foliage dry.
Leaf spot disease
PossibleHow to tell: These spots are usually darker, often with a yellow halo around them. They appear after periods of high humidity or poor drainage.
What to do: Remove the infected foliage immediately and dispose of it in the trash. Ensure the soil is not waterlogged by checking the drainage holes. Keep the leaves dry when you water.
Find out what's wrong with your hairy brome
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
If the spots are spreading rapidly to every leaf, the plant may struggle to photosynthesize. A few spots are manageable, but a full infestation requires quick action.
Stopping it coming back
Water at the base of the plant rather than over the leaves. Give your hairy brome plenty of space for air to move through its stems.
Hairy brome: spots? Check yours with a photo
Every plant is a little different. Take a photo of your hairy brome 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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Or go to pocketbotanist.app/get on your phone
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Questions people ask
- Can I use a fungicide?
- Yes, you can use a copper based fungicide if the infection is severe. Follow the label instructions carefully for the best results.
- Will the spots go away?
- No, the damaged tissue will not heal. You should remove the spotted leaves so the plant can focus its energy on healthy new growth.
Guides to these causes
More problems with hairy brome
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.