Troubleshooting
Black Currant problems — and how to fix them
Black Currant (Ribes nigrum) 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.
Big bud mite (Cecidophyopsis ribis) / Reversion virus
Big bud mite causes swollen, round buds in winter and transmits 'reversion' virus, which permanently reduces yields. Inspect in late winter; remove and destroy infected shoots. Choose resistant varieties such as 'Ben Hope', 'Ben Connan', or 'Titania'. No chemical cure for reversion — replace affected plants.
Powdery mildew (Podosphaera mors-uvae)
White powdery coating on young leaves, shoot tips, and developing berries in dry spells with warm days and cool nights. Choose resistant varieties; space plants to improve air flow; apply potassium bicarbonate or sulphur spray at first sign.
Gooseberry sawfly caterpillars
Small, pale caterpillars with black spots can defoliate plants rapidly from mid-spring. Inspect undersides of leaves near the centre of the bush from late April; pick off by hand or apply pyrethrin or an appropriate insecticide. Damage rarely kills established bushes but reduces vigour.
Prevent black currant problems before they start
Most black currant issues are care-mismatch, not bad luck. Dial in the basics:
Looking for black currant in general rather than its problems? Read the full black currant care guide — light, water, soil and feeding.
Black Currant problems — FAQ
Why is my black currant big bud mite (cecidophyopsis ribis) / reversion virus?
Big bud mite causes swollen, round buds in winter and transmits 'reversion' virus, which permanently reduces yields. Inspect in late winter; remove and destroy infected shoots. Choose resistant varieties such as 'Ben Hope', 'Ben Connan', or 'Titania'. No chemical cure for reversion — replace affected plants.
Why is my black currant powdery mildew (podosphaera mors-uvae)?
White powdery coating on young leaves, shoot tips, and developing berries in dry spells with warm days and cool nights. Choose resistant varieties; space plants to improve air flow; apply potassium bicarbonate or sulphur spray at first sign.
Why is my black currant gooseberry sawfly caterpillars?
Small, pale caterpillars with black spots can defoliate plants rapidly from mid-spring. Inspect undersides of leaves near the centre of the bush from late April; pick off by hand or apply pyrethrin or an appropriate insecticide. Damage rarely kills established bushes but reduces vigour.