Thanks for your question. It can be disappointing I know to have your beautiful roses burdened with this disease. To make matters worse the regular rain and then humid hot days in between is only providing more opportunity for the rust and black spot to continue.
Try using Neem oil. This antibacterial anti fungal organic spray will not weaken the immune system of the plant as what some synthetic alternatives can. Spray fortnightly and see how you go.
Maria – Palmers national garden consultant.
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