Roses are susceptible to a wide variety of pests and diseases. Lime sulfate, or lime and sulfur sprays, are a great way to kill fungus, mold (including black leaf mold), aphids and other pests that suck the sap of your roses. Care must be taken when using lime sulfate or sulfur sprays as these can be extremely toxic to humans and animals. They should also be applied in early morning or late evening when temperatures are low -- these sprays should never be applied when temperatures exceed 85 degrees Fahrenheit.
Instructions
1. Mix 8 tbsp. of powdered lime/sulfur per gallon of water into a fungicidal sprayer or purchase pre-mixed lime sulfur spray at your local nursery or home improvement center.
2. Remove old blooms and rake dead leaves in November as roses are going dormant for the winter. Remove any dead or diseased branches and discard. Wear gloves when pruning roses.
3. Spray rose bushes with the lime sulfate (sulfur) covering both the tops and bottoms of all leaves, as well as all canes (stems). Spray the ground around the roses as well. Spray in the early morning or in the evening, when the sun is not strong. Do not spray if the temperature is above 85 degrees Fahrenheit or if rain is expected in the next 24 hours. Do not water your roses for 24 hours after spraying.
4. Do not spray a horticultural oil on the roses for at least three days after spraying lime sulfate as this could cause stress to the bushes.
5. Spray again with the lime sulfate in early spring if the bushes show signs of mold or fungus.
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