Taken by my Gay Rose Bush by Flint Ramrod

Left untreated, the rose bush will fail to perform well, the leaves will have a wrinkled appearance and eventually die and fall off. This fungal disease produces a white powder along the tops and bottoms of the leaves and along the stems. rosae Woronichine) – Powdery mildew, or PM for short, is one of the most prevalent and serious diseases of roses. Powdery Mildew ( Sphaerotheca pannosa (Wallroth ex Fr.) Lév. The new foliage should be free of the black spots unless there is still a problem with it being active. Even after treatment and control have been achieved, the black spots will not disappear from the foliage. This particular disease is a worldwide problem for Rosarians and gardeners that grow roses. The black spot fungus, if left untreated, can totally defoliate a rose bush, causing a weakening of the overall rose bush, thus high stress on the plant. The entire leaf can turn yellow and then fall off. As it gains strength, the black spots increase in size and will start to form yellow margins around the larger black spots. This disease first shows itself on the upper leaf surfaces and some newly forming canes with small black spots upon the foliage and newer canes. A List of Common Rose Diseasesīlack Spot Fungus ( Diplocarpon rosae) – Black spot on roses can go by other names as well, such as leaf spot, leaf blotch, and star sooty mold to name a few. Remember, a disease-resistant rose bush is not a disease-free rose bush it is merely more resistant to disease.

Following this common listing are a few other diseases that may need to be dealt with from time to time in some areas. Here is a listing of the most common diseases to know about with our rose bushes in my Rocky Mountain Area as well as other areas across the country. It is important to recognize them early, as the quicker the treatment is started, the quicker control is gained, limiting the stress on the rose bush as well as the gardener! There are some frustrating diseases that will attempt to attack our rose bushes when the circumstances are right for them to get going.

Taken by my Gay Rose Bush by Flint Ramrod