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Lesser spearwort · Ranunculus flammula

What are the pests on my Ranunculus flammula?

It is less common for this plant to have pests, which usually happens when the plant is stressed by dry conditions or poor air circulation. Check for white powdery mildew or small insects on the undersides of leaves.

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

Check these first

  1. Inspect the leaves for white powdery spots.
  2. Look under the leaves for small clusters of insects.
  3. Check if the plant has been allowed to dry out.

Likely causes

  1. Powdery mildew

    Most likely

    How to tell: White, dusty patches appear on the leaves, especially during dry spells.

    What to do: Increase humidity and ensure the plant stays well watered. Remove heavily infected leaves and improve air circulation around the plant.

  2. Aphids

    Possible

    How to tell: Tiny green or black insects cluster on new growth or flower buds.

    What to do: Spray the insects off with a gentle stream of water. If they persist, use a mild insecticidal soap.

Pests on other plants

Find out what's wrong with your lesser spearwort

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

Worry if the infestation covers more than half of the foliage. It is normal to see an occasional stray bug on outdoor plants.

Stopping it coming back

Keep the soil consistently moist and ensure the plant has good airflow to prevent fungal issues.

Lesser spearwort: pests? Check yours with a photo

Every plant is a little different. Take a photo of your lesser spearwort 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 powdery mildew harmful?
It can weaken the plant and make it look unsightly. Treating it early prevents it from spreading to other parts of the plant.
Can I use chemical pesticides?
It is best to avoid harsh chemicals. Simple water sprays or insecticidal soaps are usually enough for this plant.

Guides to these causes

More problems with Lesser spearwort

Back to the Lesser spearwort 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.