Systemic fungicides control most of the milder, although quite devastating fungal
diseases, such as mildew and leaf spots. They have only a marginal effect against
rusts, which are best controlled once spotted with a contact fungicide.
Propiconazole is a systemic fungicide that can be applied at 14-day intervals, whereas chlorothalonil is a foliar protectant that should be applied every 7-10 days.
If the fungal disease is discovered and after it has been pruned out as much as possible, apply a good systemic fungicide to the entire bush and the soils immediately around the rose bush.
Use chemical sprays such as Benomyl (systemic fungicide), sulfur/fungicidal soap early in the growing season as a preventative or as soon as symptoms appear. A synthetic fungicide Baylaton sold as Strike also works well on mildew.
dead plant material reduces the risk of slugs and disease but also check for signs of fungal attack, especially as the season progresses. At first sign, either remove affected plants or cut off diseased parts and spray them with a systemic fungicide ...
Careful inspection of bulbs and the use of sterile potting mixtures will serve as preventative measures. If the disease persists even with good cultural and sanitation practices, the bulbs can be treated with a systemic fungicide.
 See also: Systemic, Fungi, Fungicide, Water, Plant
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