Powdery mildew is basically a fungal disease that affects a wide range of shrubs and plants. Powdery mildew is caused by many varied species of fungus Erysiphales. It is one of the simplest diseases to spot, as its indications are quite distinctive. A white powdery spots occurs on the leaves and stems of the infected plants. This disease affects lower leaves of the plant, but mildew can affect any above ground portion of the plant. As the disease progress, the spots get dark, larger, and denser as large amount of asexual spores are produced, and the mildew may spread upon the whole length of the plant. Powdery mildew fungi can reproduce both sexually and asexually.

Powdery mildew on roses can normally affect rose plants. The white powdery mildew starts affecting the leaves and soon spreads to the buds and other young rose roots and shoots. The affected plants bend up and finally fall off if not treated on time. Flower buds may not unfold properly, and if they do, will be badly affected by powdery mildew. As dissimilar from other spots, rose mildew is common in dry hot conditions when the root area of the rose plant is dry and lacking moisture. It usually becomes noticeable in mid and late summer and autumn. Powdery mildew affects very badly in hot autumns with dry hot days followed by cold nights. Poor air circulation is also a favorable condition of powdery mildew for roses.

One of the most common powdery mildew that effects rose bushes is known as Sphaerotheca pannosa. The common type of powdery mildew is not generally caused by free water on the leaves of the rose and other parts; instead, the mildew lives on hot and arid weather. In fact, watering the rose bush in the afternoon will definitely help to get rid of powdery mildew because it will smash up the spores that are built by the mildew during the daytime. Powdery mildew on roses can destroy the rose completely because roses are very delicate therefore, they cannot bear these bacteria. Powdery mildew can be very dangerous for roses and moreover, it can affect any species of rose. Powdery mildew is a very common rose infection, which is found in most of the countries of world.

The affected rose, which shows any sign of mildew, should be cut off from the plants and burn. To avoid this infection of roses, a preventative spraying routine should be started in early spring. The repeat applications of rose fungicide or a combined spray is very essential after every two weeks. Fungicides are also very helpful in getting rid of powdery mildew. A mixture of baking powder and vegetable oil is also a very good organic treatment for rose. Powdery mildew on roses can be removed very easily by using certain preventive measures. One of most important preventive measure is that we must keep the rose plant in an open area. We must know about the reasons of powdery mildew so that we can take a quick action against it.