Is leaf drop always a sign of disease?

Not always, as environmental stress like drought is a more common cause. Check your watering habits before assuming a disease is present.

Will my tree die if it loses leaves early?

Usually not, but it will be weakened for the following year. Provide extra care and water to help it recover for the next growing season.

Why is my sycamore maple losing its leaves? Causes and fixes

Check these first

Inspect the undersides of leaves for tiny insects.
Check the soil moisture to rule out drought.
Look for black fungal spots that might indicate tar spot disease.

Likely causes

Drought Stress
Most likely
How to tell: Leaves turn brown at the edges before falling off during a dry summer. The tree sheds leaves to conserve water for its survival.
What to do: Increase your watering frequency to every 7 to 10 days during hot, dry periods. Ensure the water reaches deep into the root zone.
Aphid Infestation
Possible
How to tell: You see sticky honeydew on the leaves or small insects on the undersides. Heavy infestations can cause leaves to yellow and drop early.
What to do: Spray the leaves with a strong stream of water to dislodge the aphids. For severe cases, use an insecticidal soap according to the label instructions.

Find out what's wrong with your sycamore maple

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 tree loses a large portion of its canopy before late summer. It is normal for the tree to drop leaves in autumn as part of its natural cycle.

Stopping it coming back

Keep the tree healthy with consistent water and monitor for early signs of pests.

Keep your sycamore maple 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

Is leaf drop always a sign of disease?: Not always, as environmental stress like drought is a more common cause. Check your watering habits before assuming a disease is present.
Will my tree die if it loses leaves early?: Usually not, but it will be weakened for the following year. Provide extra care and water to help it recover for the next growing season.

Why is my sycamore maple losing its leaves?