Gooseberry sawfly
Pale green caterpillar-like larvae with black spots, working outward from the centre of a gooseberry or redcurrant bush and stripping it to bare ribs, sometimes within a week. Where the damage starts is the identification: sawfly begins low and deep inside the bush where the eggs were laid along the veins, while every other defoliator works from the outside in.
Caused by: Nematus ribesii and related sawflies · also called common gooseberry sawfly, currant sawfly, gooseberry caterpillars
What brings it on
Up to three generations between April and August, the first often unnoticed because it is hidden in the middle of the bush. A fully stripped bush usually survives and fruits again the following year, but the current crop ripens poorly on a plant with no leaves.
source
Sourced guidancehigh confidence
- Royal Horticultural Society: Gooseberry sawfly
- Agriculture and Horticulture Development Board — AHDB: Ribes pests
Checked 2026-08-13
Usually seen: April, May, June, July, August
Preventing it
Ordered by how much difference each measure actually makes, not by how often it is repeated.
- Inspect the centre of the bush weekly from mid-April, turning up the lower leaves. Nothing else prevents it, and catching the first generation is what stops the second and third being a defoliation.
source
Horticultural consensusmoderate confidence
- Royal Horticultural Society: Gooseberry sawfly — control
Checked 2026-08-13
Dealing with it once it is there
- Pick the larvae off by hand into a bucket. On an established bush this is genuinely sufficient — they are large, slow and grouped, and a single careful pass through the interior removes most of a generation.
source
Sourced guidancehigh confidence
- Royal Horticultural Society: Gooseberry sawfly — control
Checked 2026-08-13
- A stripped bush should be watered and mulched rather than fed hard. It will releaf; a nitrogen push in midsummer produces soft growth that the next generation prefers.
Horticultural consensusDepends on conditionsmoderate confidence
Applies when: Applies to established bushes, not first-year plants, which may need lifting if wholly defoliated.
- Agriculture and Horticulture Development Board — AHDB: Soft fruit — recovery after defoliation
Checked 2026-08-13
What it affects
On sprays and treatments
GrowingHQ does not tell anyone what to apply, at what rate, or how often. Pesticide approvals differ by country, change without notice, and the product label is legally binding — it is also the document you are holding. What is described here is cultural and physical control, which is what a home grower can act on without a label in front of them.