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Fungal diseases of Rose and control measures


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 is caused by fungus in rose plant
Black spot disease in rose plant

Rose plant leaves are affected by black spot disease
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 is caused by fungus in rose plant
Powdery mildew disease in rose plant

How to control powdery mildew disease in a rose?
  The infection can be reduced through sanitation and fungicide application. Pruning and destroying all diseased canes in the spring will reduce the initial fungus population. During the growing season, all the diseased leaves should be destroyed.

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