Black Spot disease of rose plant: Circular black spots appear generally on the upper sides of the leaves. These black spots are surrounded by a yellow halo, then affected leaves are turning yellow in color. These black spots are spread by splashing water on leaves. Infection occurs after leaves are wet for several hours, seen most commonly during the rainy days. How to Control black spots on a rose? Begin with a thorough cleanup in the fall. Diseased leaves on the ground should be raked and destroyed and all the disease canes should be pruned off by several inches into good wood. Black spot disease in rose plant Affected leaves Powdery Mildew disease of rose plant: This can cause young leaves to curl and turn purple. The white fuzzy growth seen on the surface of the leaves, this fuzzy growth contains thousand of fungal spores. The wind carries these spores to young leaves, causing more infection. Powdery mildew disease in rose plant ...
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