Buy Do It Yourself Blackspot Control, Professional Grade Blackspot Killer Spray
Blackspot is a disease that is very common in ornamental roses. As with most diseases, black spot in roses is caused by humidity and wet leaf tissue. When trying to figure out how to prevent blackspot cultural habits such as watering in the morning rather than evening and proper pruning to help with air circulation can be very important. Infected leaf tissue will have tell-tale black irregularly shaped black circles before leaves begin to turn yellow. Removing affected leaves at the first sign of infection is the best cultural thing that can be done to stop the spread of black spot, as irrigation and rain can easily spread fungal spores to other leaf tissue and cause the disease to spread. Aside from cultural practices, if you are looking for how to control black spot infection on your roses, the fungicides below are all great options and highly recommended if you have the disease active on your plants.