Collect and destroy fallen leaves in the autumn, or bury under a layer of mulch. Prune out all stem lesions in spring before leaves appear. These actions will help delay the onset of the disease, but are of limited value because spores are bound to blow in on wind-blown rain from elsewhere.
Popular garden varieties of hybrid teas, floribundas, climbers and patio types are usually susceptible. Gardeners may gain a few years' respite by planting the newest varieties which claim resistance, but as discussed above, this usually does not last. Older species types are little affected.
Fungicides containing myclobutanil (Bayer Garden Systhane Fungus Fighter, several formulations), tebuconazole (Bayer Garden Multirose Concentrate 2), triticonazole (Scotts Fungus Clear Ultra) and Plant and Fish Oil Blends (Vitax Organic 2 in 1) may all be used. Some formulations of myclobutanil, tebuconazole and triticonazole contain insecticides to control pests.
It is advisable to alternate several products to maximise their effectiveness. Avoid products also containing insecticides unless there is also a pest problem that needs control.
Plant and Fish Oil Blends (Vitax Organic 2 in 1) may also be used and are permitted under some organic regimes.
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)