The Problem

Powdery Mildew on Rose

Oidium sp.

What is Powdery Mildew on Roses?

Powdery mildew on Rose is a fungus which spreads a white or ash-grey film over the upper and lower surfaces of the leaves of plants-usually the older leaves. It can be frustrating to gardeners when having to deal with roses with powdery mildew.

Favourable conditions

Warm, dry days followed by cool, humid nights are perfect conditions for an outbreak of powdery mildew.

What are the symptoms?

Powdery mildew on roses will form what looks like a white powder or film over the surface area of the rose leaves, and it may also spread to the stems and new rose buds.

It can disfigure the leaves and they will not come back to their normal shape even after the powdery mildew has been killed. Powdery mildew on rose bushes loves to attack the fresh new foliage of the plants and will also stunt the bud growth, causing disfigured blooms and, if left unchecked, will prevent the buds from opening.

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