Troubleshooting
Red currant problems — and how to fix them
Red currant (Ribes rubrum) 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.
Powdery mildew
White powdery coating on young leaves and shoots, especially in dry spells with warm days and cool nights. Improve airflow, avoid overhead watering, and apply sulphur-based fungicide if severe.
Currant aphid (Cryptomyzus ribis)
Causes red blistering on upper leaf surfaces in spring. Heavy infestations distort young growth. Spray with insecticidal soap or neem oil at bud-burst before leaf roll traps the colony.
Big bud mite (Cecidophyopsis ribis)
Swollen, round buds in late winter indicate mite infestation. Infected buds fail to open. Remove and destroy affected buds; consider replacing heavily infested plants with certified clean stock.
Prevent red currant problems before they start
Most red currant issues are care-mismatch, not bad luck. Dial in the basics:
Looking for red currant in general rather than its problems? Read the full red currant care guide — light, water, soil and feeding.
Red currant problems — FAQ
Why is my red currant powdery mildew?
White powdery coating on young leaves and shoots, especially in dry spells with warm days and cool nights. Improve airflow, avoid overhead watering, and apply sulphur-based fungicide if severe.
Why is my red currant currant aphid (cryptomyzus ribis)?
Causes red blistering on upper leaf surfaces in spring. Heavy infestations distort young growth. Spray with insecticidal soap or neem oil at bud-burst before leaf roll traps the colony.
Why is my red currant big bud mite (cecidophyopsis ribis)?
Swollen, round buds in late winter indicate mite infestation. Infected buds fail to open. Remove and destroy affected buds; consider replacing heavily infested plants with certified clean stock.