Powdery Mildew of Roses Cause, symptoms of and conditions for powdery mildew are covered, as well as ways to control the disease. The rose is one of the most popular flowering ornamentals in the world. It is thought to have first been cultivated 4,000 to 5,000 years ago in northern Africa. Today it is a favorite ornamental for landscapes, as well as the most important commercial cut flower. Although highly adaptable to many geographical regions, the rose is subject to attack by a number of plant pathogens.
Powdery mildew is one of the more serious fungal diseases.
It occurs on roses in Nebraska and, at times, can be severe. To produce a long bloom period, roses require proper care during the growing season. Plant health must be an important component of rose culture. When a disease situation gets out of hand, the popularity of roses with the home gardener can go from high to low almost overnight. This NebGuide describes the nature and control of powdery mildew on roses.