Aphids are tiny soft-bodied insects that frequently attack roses. They usually cluster around flower buds but can also be found on leaves. Gardeners can make their own spray to help rid their plants of this pest.
Using soap or oil in a homemade insecticide is called a mechanical kill. It smothers aphids, unlike chemicals, which poison them.
Soap or Oil Spray
Mix 3 tbsp of dish soap with a gallon of water for small numbers of aphids. Alternatively, you can mix 1 tsp vegetable oil, 1 tsp dish soap and 1 cup of water for infested roses. Put in a sprayer and coat all plant surfaces twice a day until aphids are gone.
The addition of oil can make a spray coat a plant better, but it is important not to apply it during the heat of the day. To avoid leaf burn, only apply in early morning or evening.