Ladybugs are nature's aphid killers, but when you have a big job like this one, you need an easy DIY aphid killer spray! This works in one day and keeps them off! Just a few drops blue dawn dish soap and warm water in a spray bottle.
I love vinegar! Rid your garden of aphids by spraying your plants with a solution of vinegar and water. 1 cup vinegar to a gallon of water. Vinegar is a natural pesticide so you can get rid of many critters by using a solution mixed with water.
apparently rose bushes love the potassium provided by dried and ground banana peels; also deters aphids. Also rubbing house-plant leaves with the inside of fresh banana skins nourishes your plants whilst dusting them :)