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Carolina horsenettle · Solanum carolinense

What are these spots on my Carolina horsenettle leaves?

Spots on this plant are less common and typically indicate insect damage rather than disease. Check the underside of the leaves for the Colorado potato beetle, which loves this nightshade family member.

spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Inspect the undersides of the leaves for beetles.
  2. Check for eggs or larvae on the foliage.
  3. Look for yellow halos around the spots.

Likely causes

  1. Colorado Potato Beetle

    Possible

    How to tell: You will see small, round holes or chewed edges on the leaves along with striped beetles or yellow eggs.

    What to do: Pick the beetles off by hand and drop them into a bucket of soapy water. You can also use neem oil spray once a week to deter them.

  2. Fungal Leaf Spot

    Possible

    How to tell: Small brown or black spots appear on the leaves, often with a yellow halo around them.

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

Find out what's wrong with your carolina horsenettle

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 small spots are rarely fatal, but you should worry if the spots are spreading quickly across the whole plant. It is normal to see slight imperfections on outdoor plants.

Stopping it coming back

Keep the area around the plant free of debris and inspect the leaves weekly during the growing season.

Keep your carolina horsenettle healthy from here

Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked. Identification and a health check are free.

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Questions people ask

Are the beetles harmful to me?
No, they are harmless to humans but very destructive to your plant. They are the most common pest for this species.
Can I use chemical pesticides?
It is better to use manual removal or organic neem oil to protect the plant and the surrounding environment.

More problems with Carolina horsenettle

Back to the Carolina horsenettle guide

This article was generated with AI from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.