Home-made aphid control products can be made using certain types of olive oil based liquid soap. Mix one gallon of water with five tablespoons of liquid soap and mix well for an effective but natural alternative to products containing harsh chemicals.
Spraying this mixture directly onto the aphids will cause the insects to suffocate and die. The application should be repeated throughout the course of the season on a regular basis, as this product will not prevent new eggs from hatching or new aphids from moving onto the plants from nearby vegetation. It should be distributed evenly on the surface of the roses using a hand sprayer and gently rinsed off with a hose after at least one hour has passed in order to remove dead aphids and soap residue. This process can be repeated as often as necessary to keep aphid populations down.