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Control Methods Overview
Non Chemical
Growing rust resistant roses lessens the risk of infection.
Grow healthy plants in well drained soil in full sun thus giving the plant optimum growing conditions.
Early spring apply 5 – 7.6cm deep organic mulch under the bush to cover over wintering ground spores
Chemical
Currently there is a large choice of products available to treat rose rust. For the treatment of rose rust an organic approach can be adopted.
How to deal with Rose Rust ; Phragmidium spp.
Rust is a fungus that affects a wide range of plants. It has the appearance of rust growing on the foliage and sometimes the stems of an infected plant. Rose rust is specific to roses. It is widely accepted that the most common and widespread rose rust through out the UK is Phragmidium tuberculatum and less frequently Phragmidium mucronatum the latter being more specific to the U.S.A.
Severe infection of rust can lead to premature defoliation, which can weaken the plant and cause die back. The over wintering spores can survive on fallen leaves and on the soil surface. They can also become attached to objects such as stakes, fences and rose stems. The fungus can also survive the winter in stem lesions caused by other diseases. The optimum conditions for Phragmidium spp. are a temperature between 18C to 21C with continuous moisture for 2 to 4 hours.
Some roses are more susceptible to rose rust and some show a natural resistance. There are two methods of control non-chemical or chemical treatment. The RHS recommend the minimal use of chemical treatments. Guidance can be found from the Royal Horticultural Society www.rhs.org.uk/advice.
I would recommend a non chemical approach which can show significant improvements. This can be supported with the additional use of chemicals using the accepted organic approach.
Find out how to control Rose Rust