Gooseberry sawfly

The common gooseberry sawfly is one of several sawfly species that can attack gooseberry and red/white currant bushes during spring and summer.

Common gooseberry sawfly (Nematus ribesii) on Gooseberry (Ribes uva-crispa). Credit: RHS/Entomology

Quick facts

Common name Common gooseberry sawfly, spotted gooseberry sawfly and small gooseberry sawfly
Scientific name Nematus ribesii, Nematus leucotrochus and Pristiphora appendiculata
Plants affected Gooseberry, red and white currants
Main symptoms Foliage is rapidly devoured by caterpillar-like larvae that are green with black dots
Most active April to September

What is gooseberry sawfly?

Damage  is caused by the caterpillar-like larvae of several species of sawfly that devour the leaves.

    The foliage on gooseberry red/white currants bushes is often striped by one of three species of gooseberry sawflies.

    Symptoms

    • Severe defoliation of the bushes can be caused by the caterpillar-like larvae of one of three species of sawfly
    • Larvae of the common gooseberry sawfly are up to 20mm (almost ¾in) long, pale green, with many black spots, and black heads  The adults are winged insects;  females are 5-7mm (up to ¼in) long and are yellow with black heads and black markings on the thorax; males are similar but more extensively marked with black, including the upper surface of the abdomen
    • Larvae of the pale spotted gooseberry sawfly are slightly smaller than those of the common gooseberry sawfly and have pale green heads. It has one generation a year with larvae present in May and June 
    • The small gooseberry sawfly can have up to four generations of pale green larvae from late April onwards
    • The larvae of some moths may also eat the foliage of gooseberries and currants

    Control

    Non-chemical control

    • Regularly check the plants from mid-April onwards for sawfly larvae and pick them off by hand
    • A biological control (pathogenic nematode), sold as Nemasys Grow Your Own, can be watered onto infested plants. The nematodes enter the bodies of the sawfly larvae and infect them with a bacterial disease. This nematode is available from some garden centres or via mail order

    Chemical control

    • Spray when young larvae are seen, with an insecticide approved for use on the appropriate food plant. Make sure that the manufacturer's instructions are followed. 
    • Suitable insecticides are thiacloprid (e.g. Provado Ultimate Bug Killer), lambda-cyhalothrin (e.g. Westland Resolva Bug Killer), deltamethrin (e.g. Bayer Provado Ultimate Fruit & Vegetable Bug Killer) or an organic pesticide such as pyrethrum (e.g. Py Spray Garden Insect Killer or Bug Clear Gun for Fruit & Veg)
    • Plants in flower should not be sprayed due to the danger to pollinating insects

    Download

    Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)

    Biological control suppliers (Abode Acrobat pdf)

    Biology

    • The common gooseberry sawfly is the most troublesome pest of gooseberries. It can have three generations a year, with the larvae active in late April to June, July, and August to September
    • The female sawflies lay eggs on the underside of leaves, low down in the centre of the bush, so the young larvae go unnoticed until they have eaten their way upwards and outwards, devouring the leaves as they go
    • Defoliated plants are weakened and may produce a poor crop the following year
    • When the larvae are fully fed, they go into the soil, where they spin silk cocoons and pupate
    • The pale spotted gooseberry sawfly only has one generation a year with larvae present in May and June
    • The small gooseberry sawfly has up to four generations a year with larvae present from late April

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