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Honey mesquite · Prosopis glandulosa

Why are there spots on my honey mesquite leaves?

It is less common for this plant to develop spots, which usually result from fungal infections during periods of high humidity or poor airflow. Check for signs of mistletoe or fungal growth on the branches first.

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spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Look closely at the branches for parasitic mistletoe clumps.
  2. Examine the underside of the leaves for fungal spores.
  3. Check if the tree is crowded by other plants.

Likely causes

  1. Fungal Leaf Spot

    Most likely

    How to tell: Small dark or tan spots appear on the leaflets, sometimes with a yellow halo. This usually occurs after prolonged wet weather.

    What to do: Remove and destroy any fallen leaves to prevent spores from spreading. Improve airflow around the tree by pruning crowded branches.

  2. Mistletoe Infestation

    Possible

    How to tell: You will see green, bushy clumps growing on the branches that look different from the mesquite foliage. These parasites can cause localized leaf stress and spotting.

    What to do: Prune out the infected branches at least 6 to 12 inches below the point of attachment. Monitor the tree annually to catch new growth early.

Leaf spots on other plants

Find out what's wrong with your honey mesquite

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 spots cover a large portion of the canopy or if mistletoe is strangling major branches. A few spots are normal in humid seasons.

Stopping it coming back

Keep the tree canopy open to allow sunlight and air to reach the inner branches.

Honey mesquite: spots? Check yours with a photo

Every plant is a little different. Take a photo of your honey mesquite 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 harmful?
Most leaf spots are cosmetic and won't kill the tree. Mistletoe, however, is a serious parasite that needs removal.
Should I use a fungicide?
Fungicides are rarely needed for honey mesquite. Cultural practices like pruning are much more effective.

Guides to these causes

More problems with Honey mesquite

Back to the Honey mesquite 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.