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Rose leaf-rolling sawfly causes tightly rolled leaves on wild and cultivated roses. This is sometimes mistaken for weedkiller damage.
Leaf-rolling sawfly damage on a rose. Image: RHS/Tim Sandall
Sawflies are in the same group of insects as bees, ants and wasps (the Hymenoptera). They have caterpillar like larvae that feed on plants the adults are winged insects that can appear fly-like.
Rose leaf-rolling sawfly is an insect that can damage roses. Female sawflies insert eggs into rose leaflets, and while doing so, secrete chemicals that induce leaf rolling. Sometimes the leaflet is probed but no egg is laid, this process still results in leaf curling. Caterpillar-like larvae emerge from the eggs and feed within the rolled leaflets.
You may see the following symptoms:
Light infestations can be tolerated, there may be a loss of vigour where a large proportion of foliage is affected although plants usually recover.
Affected leaves can be picked off before the larvae complete their feeding; this is only feasible when comparatively few leaves are affected. The removal of large numbers of leaves would be more harmful to the rose than the damage caused by the sawfly. Cultivation of the soil around roses during the winter may expose overwintering larvae, but may damage the roots and encourage suckering.
Pesticides available to home gardeners are unlikely to control this insect. It is impractical to prevent the females laying eggs and initiating the damage as they can be active over a six to eight week period in late spring to early summer and pesticides are unlikely to affect larvae in the rolled leaves.
The adult sawfly is 3-4mm (about 1/8in) long, black in colour with two pairs of transparent wings. The females insert eggs into the leaflets during late April to early June and while doing so secrete chemicals that induce leaf rolling.
The eggs hatch into pale green caterpillar like larvae, which grow up to 10mm (about 3/8in) long as they feed inside the rolled leaflets. During late June and July the larvae go down into the soil where they overwinter as non-feeding larvae before pupating in the spring. There is one generation per year.
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