Bright orange/brown/black spots, or pustules develop on the upper leaf surface with corresponding bright orange spore masses beneath. Dark brown over-wintering spores can often be seen from late summer/early autumn. Severely infected leaves will drop prematurely. Product Solution: Multirose Concentrate 2, Fungus Fighter Disease Control Ready To Use, Systhane Fungus Fighter. Spray preventatively, use before rust is evident on the underside of the leaves, use at 14 day intervals during the main growing season.
Cultural control: Prune out stems showing early spring infections. This must be done promptly and thoroughly. Improve air circulation within the where possible by pruning out unwanted branches, avoid planting out too closely.