- 1). Apply the sulfur at the first sign of disease, or in early spring, on dormant roses, as a preventive measure. If you live in a region with warm spring weather, wait until the temperature is forecast to remain below 90 degrees Fahrenheit to apply the sulfur.
- 2). Dust the rose with the sulfur powder so that all surfaces are completely covered. If you use the product as a spray, mix it with the required amount of water and spray the rose thoroughly until all parts of it are covered. Stay out of the treated area for 24 hours after application.
- 3). Reapply the sulfur according to the schedule listed on the package or after a heavy rain.
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