Troubleshooting
Coastal Leucothoe problems — and how to fix them
Coastal Leucothoe (Leucothoe axillaris) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Leaf spot diseases (Cercospora / Anthracnose)
Brown or black spots with water-soaked or yellow margins appear in humid conditions with poor air circulation; avoid overhead irrigation, remove and destroy affected leaves, improve airflow by thinning, and apply copper-based fungicide if widespread.
Scale insects
Armoured or soft scale insects can colonise stems and leaf undersides, causing yellowing and sticky honeydew that promotes sooty mould; treat with horticultural oil in late winter before new growth emerges, or use systemic insecticide in severe infestations.
Prevent coastal leucothoe problems before they start
Most coastal leucothoe issues are care-mismatch, not bad luck. Dial in the basics:
Coastal Leucothoe problems — FAQ
Why is my coastal leucothoe leaf spot diseases (cercospora / anthracnose)?
Brown or black spots with water-soaked or yellow margins appear in humid conditions with poor air circulation; avoid overhead irrigation, remove and destroy affected leaves, improve airflow by thinning, and apply copper-based fungicide if widespread.
Why is my coastal leucothoe scale insects?
Armoured or soft scale insects can colonise stems and leaf undersides, causing yellowing and sticky honeydew that promotes sooty mould; treat with horticultural oil in late winter before new growth emerges, or use systemic insecticide in severe infestations.