Garden Q&A: How should I treat mildew and blight on 'Red Robin' shrubs?

Whether you're a gardening beginner or expert, Irish Examiner columnist Peter Dowdall has the answer to your questions

The red and green leaves of Photinia fraseri 'Red Robin' shrub. File picture

Question

My Photinia 'Red Robin' shrubs have brown spots, powdery mildew and fireblight. Is copper sulphate pentahydrate suitable to treat them?