Roseclear Ultra is currently approved for a maximum of four treatments per year. The long lasting systemic activity of the treatment is sufficient to prevent diseases establishing on the plant, providing that it is started at the onset of growth and continued at regular intervals.
If the pests and or disease attack is particularly persistent and additional treatments are needed, then the alternative Bug Clear Ultra or Fungus Clear Ultra can be used to clear the problem.
The first signs of blackspot and other fungal diseases on roses appear from May onwards, but the fungal spores will have entered the plant as the new leaves unfurl in March/April. Early treatment at bud burst is therefore vital to help prevent serious infection. It is also important to observe good hygiene by the removal of all leaf debris, which should be burnt and not composted. Prevention is better than cure, but should fungal infections take hold, the prompt removal of any leaves showing symptoms, combined with application of Roseclear will generally control the spread.