Will these spots kill my beautyberry?

Usually no. It is mostly a cosmetic issue that rarely harms the long term health of an established shrub.

Should I use a fungicide?

Only if the infection is widespread and causing significant leaf loss. Good cultural practices like pruning and proper watering are usually enough.

Why are there spots on my American beautyberry leaves?

Check these first

Inspect the undersides of the leaves for fungal spores.
Check if the plant is crowded by other shrubs.
Look for signs of standing water near the base.

Likely causes

Fungal Leaf Spot
Most likely
How to tell: You will see brown or black circular spots that may have a yellow halo. These often appear after long periods of rain or high humidity.
What to do: Remove and destroy any infected leaves to stop the spread. Improve airflow by pruning nearby branches and avoid overhead watering that keeps the foliage wet.
Cercospora Leaf Spot
Possible
How to tell: This fungus creates angular, dark spots that are limited by the leaf veins. It typically shows up in late summer as the plant matures.
What to do: Clean up all fallen leaves around the base of the plant in autumn. Apply a copper based fungicide if the infection is severe and threatens the overall health of the shrub.

When to worry

It is normal to see a few spots late in the season as the plant prepares for dormancy. Worry only if the spots cover more than half the foliage or cause premature leaf drop.

Stopping it coming back

Space your plants properly to ensure good air movement and always water at the soil level rather than wetting the leaves.

Not sure which one it is? Photograph your american beautyberry.

This page lists the usual causes. Pocket Botanist looks at your actual leaf 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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Questions people ask

Will these spots kill my beautyberry?: Usually no. It is mostly a cosmetic issue that rarely harms the long term health of an established shrub.
Should I use a fungicide?: Only if the infection is widespread and causing significant leaf loss. Good cultural practices like pruning and proper watering are usually enough.