Troubleshooting
Robin Hill serviceberry problems — and how to fix them
Robin Hill serviceberry (Amelanchier x grandiflora 'Robin Hill') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Fire blight (Erwinia amylovora)
Affects shoots and blossoms in warm, wet springs; tips blacken and curl. Prune infected wood 30 cm below the lesion into clean wood, sterilising tools between cuts.
Cedar-apple rust (Gymnosporangium)
Orange pustules on leaves if junipers or Eastern red cedars grow nearby. Remove nearby alternate hosts where practical; apply preventive copper-based fungicide at bud break.
Powdery mildew
White coating on foliage in humid, low-airflow conditions. Improve spacing, prune for air circulation, and apply neem oil or potassium bicarbonate sprays at first sign.
Prevent robin hill serviceberry problems before they start
Most robin hill serviceberry issues are care-mismatch, not bad luck. Dial in the basics:
Robin Hill serviceberry problems — FAQ
Why is my robin hill serviceberry fire blight (erwinia amylovora)?
Affects shoots and blossoms in warm, wet springs; tips blacken and curl. Prune infected wood 30 cm below the lesion into clean wood, sterilising tools between cuts.
Why is my robin hill serviceberry cedar-apple rust (gymnosporangium)?
Orange pustules on leaves if junipers or Eastern red cedars grow nearby. Remove nearby alternate hosts where practical; apply preventive copper-based fungicide at bud break.
Why is my robin hill serviceberry powdery mildew?
White coating on foliage in humid, low-airflow conditions. Improve spacing, prune for air circulation, and apply neem oil or potassium bicarbonate sprays at first sign.