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Key lime · Citrus aurantiifolia

How do I get rid of pests on my Key lime tree?

Pests like aphids love the tender new growth on your Key lime tree. Catching them early is the best way to keep your tree healthy and productive.

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

Check these first

  1. Look closely at the undersides of the leaves.
  2. Check the new growth tips for sticky residue.
  3. Inspect the stems for small bumps.

Likely causes

  1. Aphids

    Most likely

    How to tell: You will see tiny green or black insects clustered on the undersides of leaves or on new buds. They leave behind a sticky substance called honeydew.

    What to do: Spray the affected areas with a strong stream of water to knock them off. If they persist, apply neem oil or insecticidal soap once a week until they are gone.

  2. Scale Insects

    Possible

    How to tell: These look like small brown bumps on the stems or leaf veins. They do not move and are hard to the touch.

    What to do: Scrape them off gently with a soft toothbrush or cotton swab dipped in rubbing alcohol. Treat the tree with horticultural oil to kill any remaining eggs.

Pests on other plants

Find out what's wrong with your key lime

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

A few aphids are manageable, but a heavy infestation can stunt growth and spread disease. Take action as soon as you spot them.

Stopping it coming back

Keep your tree healthy with proper light and water, as stressed plants are more attractive to pests. Check your tree weekly for any signs of visitors.

Key lime: pests? Check yours with a photo

Every plant is a little different. Take a photo of your key lime 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 bugs harmful to me?
No, aphids and scale are not harmful to humans. They only target the plant.
Can I use dish soap to kill them?
You can use a very mild, non-degreasing soap diluted in water. Avoid harsh detergents that can damage the leaves.

Guides to these causes

More problems with Key lime

Back to the Key lime 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.