mildew
By Jan_andy
United Kingdom 
hi everyone hope you are all ok.been in my garden this afternoon and noticed all my roses have mildew.does anyone know what is causing this am i doing something wrong.what do i do.
11 Jun, 2009
Answers
It is caused by dryness at the root and we have had a very dry spring
11 Jun, 2009
Water it well at the roots and mulch it and clear up any fallen diseased leaves.
11 Jun, 2009
When the plant becomes dehydrated it gets stressed. Then a fungal infection like mildew can make an attack. When the plant is slightly weakened, the fungus launches its offensive against it. Help it fight back with watering and a spraying like they say.
11 Jun, 2009
thank you everyone for your helpful advise.
11 Jun, 2009
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No, you're not doing anything wrong, though sometimes bad pruning can encourage it. You need to get yourself a fungicidal spray and apply it. Try Roseclear, mix it up yourself according to the instructions - this also deals with aphids, etc.
11 Jun, 2009