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clustered dock · Rumex conglomeratus

What are these spots on my clustered dock leaves?

Pests are less common for this plant, but it is highly susceptible to rust fungus which appears as orange or brown pustules on the undersides of leaves. Check the undersides of your leaves first to see if you have a fungal issue rather than an insect.

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pests on a plant
Photo: Jules Verne Times Two, CC BY-SA 4.0

Check these first

  1. Inspect the undersides of the leaves for orange spots.
  2. Look for tiny insects on the new growth.
  3. Check for sticky residue on the leaves.

Likely causes

  1. Rust Fungus

    Most likely

    How to tell: You will see small orange or brown powdery pustules on the undersides of the leaves. The leaves may eventually yellow and drop.

    What to do: Remove and destroy all infected leaves immediately to stop the spread. Improve air circulation around the plant and avoid getting water on the foliage when you irrigate.

  2. Aphids

    Possible

    How to tell: Tiny green or black insects cluster on the new growth and undersides of leaves. They often leave behind a sticky residue called honeydew.

    What to do: Spray the plant with a gentle stream of water to knock the aphids off. If they persist, apply insecticidal soap once a week until they are gone.

Pests on other plants

Find out what's wrong with your clustered dock

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

Rust fungus is serious and can quickly weaken the entire plant if left untreated. Minor aphid sightings are manageable with quick action.

Stopping it coming back

Keep the leaves dry when watering and ensure the plant has plenty of space for air to move around it.

Clustered dock: pests? Check yours with a photo

Every plant is a little different. Take a photo of your clustered dock 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

Is rust fungus contagious to other plants?
Yes, rust spores can travel through the air to other susceptible plants. Isolate your dock immediately if you spot the orange pustules.
Can I use neem oil for the rust?
Neem oil can act as a preventative, but it is not a cure for established rust. Focus on removing infected leaves and improving airflow.

Guides to these causes

More problems with clustered dock

Back to the clustered dock 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.