Answer: There are a number of fungal diseases that target roses, and you can help your plants avoid disease attacks by planting them where they get full sunshine, making sure there's good air circulation all around, keeping water off the foliage late in the day, and pruning out affected plant parts as soon as you see signs of black spot or powdery mildew.
Fungicides generally recommended for blackspot control include:
Daconil 2787 or fungicides containing Daconil
Frequently used fungicides for control of powdery mildew include:
Depending upon the problem, you can use one of the above listed fungicides. Be sure to follow the label directions for frequency of application recommendations.
Q&A Library Searching Tips