Are these spots contagious to my other plants?

If the spots are caused by a fungus or pests, they can spread, so it is best to isolate the plant until it is healthy again.

Can I use a fungicide for the spots?

You can, but improving the environment is usually more effective for this plant than chemical treatments.

Large bindweed: spots, causes and fixes

Check these first

Inspect the undersides of the leaves for small insects.
Check if the leaves are staying wet for too long after watering.
Look for signs of poor airflow around the plant.

Likely causes

Fungal leaf spot
Possible
How to tell: Small, dark, or water-soaked spots appear on the leaves, sometimes with a yellow halo. These spots may grow larger over time if the humidity remains high and airflow is low.
What to do: Remove and dispose of any heavily affected leaves to stop the spread. Improve air circulation around the plant by spacing it further from other plants or using a small fan. Avoid getting water on the leaves when you water the soil.
Pest damage
Possible
How to tell: Tiny yellow or brown stippling appears on the leaves, often accompanied by small insects on the undersides. This is often caused by spider mites or thrips feeding on the leaf cells.
What to do: Wipe the leaves down with a damp cloth to remove the pests. Use a gentle insecticidal soap or neem oil spray on the affected areas once a week until the insects are gone. Ensure the plant is healthy and well-watered to help it resist future infestations.

Leaf spots on other plants

Find out what's wrong with your large bindweed

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 are spreading rapidly across the entire plant, you should take immediate action to isolate it and treat the cause.

Stopping it coming back

Keep the foliage dry when watering and ensure there is plenty of fresh air moving around your plant.

Large bindweed: spots? Check yours with a photo

Every plant is a little different. Take a photo of your large bindweed 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

Are these spots contagious to my other plants?: If the spots are caused by a fungus or pests, they can spread, so it is best to isolate the plant until it is healthy again.
Can I use a fungicide for the spots?: You can, but improving the environment is usually more effective for this plant than chemical treatments.

Guides to these causes

Leaf Spot

Why are there spots on my large bindweed leaves?

Check these first

Not sure what's wrong with your large bindweed?