One week your gooseberry bush is in full leaf. The next it's a skeleton of stalks with a few hard green berries hanging off it. That's gooseberry sawfly, and the reason it seems to happen overnight is that the early damage is hidden in the middle of the bush. The honest fix isn't a spray. It's looking in the right place, early, and picking the larvae off.
01At a glance
- What it is: caterpillar-like larvae of small sawflies, pale green with black spots, up to about 2cm long.
- Where to look: low in the centre of the bush, on the undersides of the leaves. That's where the eggs are laid.
- When: from April. The common species has three generations a year, so larvae can turn up again in July and in August to September.
- What to do: check every few days and pick them off by hand. Keep the centre of the bush open so you can see in.
- How bad is it: a stripped bush almost always survives, but it's weakened and may crop poorly the following year.
02Why it catches you out
The adult sawflies lay their eggs on the underside of leaves deep in the middle of the bush. The young larvae feed there first, working upwards and outwards. By the time you notice holes on the outer leaves, the inside is already bare and the larvae are big and hungry.
There are actually three sawfly species that do this on gooseberries, and their timings overlap. The common gooseberry sawfly has larvae from late April to June, again in July, and again in August to September. Another species has one generation in May and June; a third can manage up to four from late April. You don't need to tell them apart. You just need to know that one clean-up in May doesn't mean you're done for the year.
When they've finished feeding, the larvae drop into the soil to pupate, which is why the problem comes back to the same bush.
03What to do, step by step
- Start checking in April. Kneel down, part the branches and look at the undersides of the lowest leaves in the centre of the bush. Gloves help: gooseberry stems are thorny.
- Look for small green larvae and freshly nibbled leaves. Damage on the lowest leaves in the middle of the bush is the early sign.
- Pick them off by hand. Drop them in a pot of water or squash them. A whole leaf covered in young larvae can simply be picked and binned.
- Repeat every few days through spring, then keep an eye out again in July and late summer for the next generations.
- Prune for an open centre in winter. A goblet-shaped bush with an airy middle is far easier to inspect.
The RHS also lists a biological control, a nematode watered onto affected plants, available to home gardeners. It works best in cool, damp weather. The RHS notes nematodes can affect non-target creatures, so use it only for a real, specific problem. For most gardens, hand-picking is enough.
Birds, wasps and ground beetles all eat sawfly larvae, so a garden with plenty of wildlife gives you some free help.
04Red and white currants, and blackcurrants
The RHS lists red and white currants as hosts too, so check them the same way. Blackcurrants aren't on the RHS list for gooseberry sawfly. Research at the James Hutton Institute notes a separate blackcurrant sawfly, found mainly on blackcurrant, which it describes as a sporadic pest. If you find green larvae stripping a blackcurrant, checking the centre and picking them off by hand is the sensible approach.
05Is it sawfly or something else?
- Pale green larvae with black spots and black heads, starting in the middle of the bush: sawfly. (One species has pale green heads instead, but the damage pattern is the same.)
- Caterpillars that look different: the RHS notes some moth caterpillars also eat gooseberry and currant leaves. Pick these off too.
- White powdery coating, not holes: that's mildew, not a pest. See the gooseberry profile.
- Leaves gone, but you see nothing: the larvae may have finished and gone into the soil. Note the date and check earlier next year.
Before handling the bushes or planting where children or pets play, check the safety flags on our gooseberry and blackcurrant profiles.
How we checked this
Every care and safety claim on this page is verified against horticultural and veterinary sources.
Sources: RHS — Gooseberry sawflies · James Hutton Institute — Ribes pests
Checked 8 October 2026. If our advice ever conflicts with the RHS, believe them and tell us.