Light infestations can usually be tolerated, but where a large proportion of foliage has been affected, the plant may suffer a loss of vigour.
Non chemical control
Pick off affected leaves and dispose of them 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 pest damage. Cultivation of the soil around roses during the winter may expose overwintering larvae, but may also damage the roots and encourage suckering.
It can be difficult to prevent the females laying eggs and initiating the damage. Pesticides often do not reach the larvae in the rolled leaves.
Deltamethrin (e.g. Bayer Sprayday Greenfly Killer) or lambda-cyhalothrin (e.g. Westland Plant Resolva Bug Killer) will control the adult sawflies but as these are active over a six to eight week period in late spring-early summer, several applications would be necessary to prevent egg-laying.
The systemic insecticide thiacloprid (e.g. Provado Ultimate Bug Killer) may control the larvae feeding inside the rolled leaves.
Plants in flower should not be sprayed due to the danger to pollinating insects.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)