Are aphids harmful to my poplar?

Aphids can weaken the tree and cause unsightly leaf curling. While rarely fatal, they should be managed to keep the tree healthy.

Should I remove curled leaves?

Only remove leaves that are dead or severely damaged. Healthy leaves that are just curled may still perform photosynthesis for the tree.

Why are my black poplar leaves curling? Causes and fixes

Check these first

Inspect the undersides of the leaves for small insects.
Check for sticky residue on the leaves or branches.
Observe if the curling happens only during the hottest part of the day.

Likely causes

Aphid infestation
Most likely
How to tell: You see small insects on the undersides of leaves and a sticky substance called honeydew on the foliage. The leaves may curl or pucker where the aphids feed.
What to do: Spray the leaves with a strong stream of water to dislodge the aphids. For heavy infestations, apply insecticidal soap according to the label instructions.
Heat stress
Possible
How to tell: The leaves curl inward during the hottest part of the day to conserve moisture. They usually recover once the temperature drops in the evening.
What to do: Provide extra water during extreme heat waves to keep the soil moist. Mulch around the base of the tree to help keep the roots cool.

Curling leaves on other plants

Find out what's wrong with your black poplar

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

If the leaves remain curled even at night, the tree is under significant stress. It is normal for leaves to curl slightly in extreme heat to protect themselves.

Stopping it coming back

Monitor your tree regularly for pests and ensure it stays well hydrated during hot summer months.

Black poplar: curling leaves? Check yours with a photo

Every plant is a little different. Take a photo of your black poplar 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 aphids harmful to my poplar?: Aphids can weaken the tree and cause unsightly leaf curling. While rarely fatal, they should be managed to keep the tree healthy.
Should I remove curled leaves?: Only remove leaves that are dead or severely damaged. Healthy leaves that are just curled may still perform photosynthesis for the tree.

Guides to these causes

Aphids

Why are my black poplar leaves curling?