🐛✗ Tested and false“You can prune out the affected shoots and save a blackcurrant bush with reversion virus”
Reversion virus is systemic in the bush, not confined to the shoots showing narrowed leaves, so cutting those stems out doesn't remove the infection. Neither institutional source describes pruning as a control for reversion once it's diagnosed; both point to removing the whole plant instead. The bud-picking some gardeners remember from blackcurrant care is a big bud mite control for lightly infested plants, a separate problem, not a treatment for the virus the mite can also carry.
Our read The confusion likely comes from big bud mite management genuinely including a pick-off-and-dispose step for lightly affected buds. That's real, but it targets the mite's galls, not reversion symptoms, and RHS keeps the two responses distinct: bud-picking for light mite infestation, whole-plant disposal for reversion.
What to do: Once a bush shows reversion symptoms, don't rely on pruning. Dig it up and dispose of it, then replant with certified virus-free stock.
2 sources
- RHS: Blackcurrant big bud miteRecommends disposing of heavily affected plants entirely and replanting with clean stock, while bud-picking is offered only as a mite control for lightly affected plants, not as a treatment for reversion.
- James Hutton Institute: Blackcurrant reversionLists removal of reverted bushes from the plantation as soon as diagnosed as the control measure, with no mention of pruning out affected growth as an alternative.
“Reversion virus just makes the leaves look different, it doesn't actually cut the crop”
Both sources tie reversion directly to reduced fruit yield, not just a cosmetic leaf change. The narrowed, distorted leaves are the easiest symptom to spot and give the disease its name, which is probably why the myth focuses on them, but the yield decline runs alongside that, not instead of it.
What to do: Treat visible leaf distortion as a sign the bush's cropping is already declining, not a purely cosmetic issue to tolerate. Diagnose and remove the bush rather than waiting to see if fruiting holds up.
2 sources
“Reversion virus can spread to a healthy blackcurrant bush through the soil or touching roots, not just via the mite”
Big bud mite is the means of transmission from an infected plant to a healthy one, with no other route documented. That matters practically: a healthy bush planted near an infected one isn't automatically at risk through the soil, root contact, or pruning tools the way some virus diseases spread. The mite is the thing to watch for, not general proximity.
What to do: Don't dig up or isolate healthy bushes just because they're growing near an infected one. Focus on checking for big bud mite galls instead, since that's the actual transmission risk.
1 source
“Once you've bought certified virus-free blackcurrant stock, that bush is protected from reversion virus for good”
Certified stock is inspected and declared free of both big bud mite and reversion at the point of sale, which is a real and useful guarantee, but it's a guarantee about that moment, not about every year afterward. Reversion has no known transmission route except big bud mite, and a mite population can still establish itself in a garden after planting, carrying the virus in from elsewhere. Neither source frames certified stock as removing the need for ongoing vector control.
Our read Both sources list certified stock and vector control as separate, ongoing measures rather than certified stock alone being treated as sufficient, which reads as an implicit acknowledgment that a clean start doesn't remove later risk.
What to do: Start with certified stock, but keep checking for big bud mite year to year rather than treating the certification as a one-time fix. If mite galls show up nearby, that's when reversion risk returns even on a bush that started clean.
2 sources
- RHS: Blackcurrant big bud miteRecommends buying stock plants certified free of big bud and reversion, inspected and declared free of the mite at the nursery, alongside separate ongoing mite-control advice.
- James Hutton Institute: Blackcurrant reversionIdentifies big bud mite as the means by which reversion spreads from an infected plant to a healthy one, with no other transmission route described.
