Diseases and pests of roses
Among the most common parasites that can attack your rose bush are both those of animal origin and those of plant origin. For example, aphids of roses belong to the first group, infesting stems, leaves and buds and causing the plant to fail to grow. There are also the tortrix that wrap the leaves in a network of silky consistency, or the cicadella that feeds on the sap by drying the leaves; the sawfly instead attacks the leaf blade, while the carruga damages the buds.
All these pests can be driven off with specific insecticides.
As far as plant parasites are concerned, we mainly mention the “white mal of the rose”, that is the formation of a whitish powder on buds, leaves and buds: in this case the leaves turn yellow and dry, while the buds do not open and the flowers present spots on the petals. The rust causes bright orange spots, while the yellow blight browns. In these cases it is good to cut the infected parts and burn them to then treat the rest of the plant with a fungicide. Further diseases are bacterial tumors, which manifest themselves with tumor growths at the base of the plant the size of a walnut, which quickly lead to death, and chlorosis, that is leaf yellowing due to lack of iron.