Are the aphids going to kill my tree?

Usually not, but they can weaken it and cause unsightly honeydew. Treating them early prevents the problem from spreading.

Should I use a systemic pesticide?

It is better to start with gentle methods like water sprays or insecticidal soap. Avoid harsh chemicals that might harm beneficial insects.

Why are my crape myrtle leaves curling? Causes and fixes

Check these first

Inspect the undersides of the curled leaves for aphids.
Check the soil moisture to see if the plant is thirsty.
Look for sticky residue on the leaves or branches.

Likely causes

Aphid Infestation
Most likely
How to tell: Leaves curl downward and you may see a sticky substance called honeydew on the foliage. Tiny green or black insects are usually visible on the undersides of leaves.
What to do: Spray the leaves with a strong stream of water to knock the aphids off. If the infestation is heavy, apply insecticidal soap every 7 days until they are gone.
Heat Stress
Possible
How to tell: The leaves curl inward during the hottest part of the day to conserve moisture. The plant looks wilted but recovers once the sun goes down.
What to do: Ensure you are watering deeply every 7 to 14 days when the top few inches of soil are dry. Adding a layer of mulch around the base helps keep the roots cool and moist.

Curling leaves on other plants

Find out what's wrong with your crape myrtle

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.

When to worry

Worry if the curling is accompanied by yellowing or if the aphids are covering the entire plant. Temporary curling during a heatwave is a normal reaction to high temperatures.

Stopping it coming back

Keep your plant healthy with consistent watering and monitor for pests early in the season. A healthy plant is much better at resisting aphid attacks.

Crape myrtle: curling leaves? Check yours with a photo

Every plant is a little different. Take a photo of your crape myrtle 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.

Get the app · Or check it from a photo now, free

Questions people ask

Are the aphids going to kill my tree?: Usually not, but they can weaken it and cause unsightly honeydew. Treating them early prevents the problem from spreading.
Should I use a systemic pesticide?: It is better to start with gentle methods like water sprays or insecticidal soap. Avoid harsh chemicals that might harm beneficial insects.

Guides to these causes

Aphids

Why are my crape myrtle leaves curling?