Is crown rust fatal to my buckthorn?

It is rarely fatal, but it can weaken the plant over time. Keeping the foliage dry and cleaning up fallen leaves is usually enough to manage it.

Can I use a fungicide for the leaf drop?

Fungicides are generally not recommended for common buckthorn. Focus on cultural practices like improving airflow and removing infected material instead.

Common buckthorn: leaf drop, causes and fixes

Check these first

Examine the undersides of the leaves for orange or yellow spots.
Check the soil to see if it has been too wet or too dry lately.
Look for signs of pests that might be feeding on the foliage.

Likely causes

Crown rust infection
Most likely
How to tell: You will see bright orange or yellow pustules on the undersides of the leaves. Infected leaves often turn yellow and fall off early in the season.
What to do: Remove and destroy all infected leaves to prevent the fungus from spreading. Avoid overhead watering to keep the foliage dry, as moisture encourages the rust to thrive.
Extreme heat stress
Possible
How to tell: Leaves turn brown at the edges before dropping off during a heatwave. The entire plant may look sparse as it tries to conserve energy.
What to do: Provide temporary shade during the hottest part of the day. Ensure the soil stays hydrated so the plant does not have to shed foliage to survive.

Leaf drop in other plants

Find out what's wrong with your common buckthorn

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 leaf drop is sudden and affects more than half the plant. It is normal for the shrub to lose some leaves in late autumn as it prepares for winter.

Stopping it coming back

Space your shrubs properly to ensure good air circulation. Keep the area around the base clear of fallen debris to reduce fungal spores.

Common buckthorn: leaf drop? Check yours with a photo

Every plant is a little different. Take a photo of your common buckthorn 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

Is crown rust fatal to my buckthorn?: It is rarely fatal, but it can weaken the plant over time. Keeping the foliage dry and cleaning up fallen leaves is usually enough to manage it.
Can I use a fungicide for the leaf drop?: Fungicides are generally not recommended for common buckthorn. Focus on cultural practices like improving airflow and removing infected material instead.

Why is my common buckthorn losing its leaves?