Use an insecticidal soap spray found at most big box stores ....or make your own at a fraction of the cost
insecticidal soap recipe:
you will need a 1 quart (or 1 gallon size) sprayer or mister
Mix 1 tablespoon of unscented Castile soap in 1 quart of water, or 5 tablespoons in 1 gallon of water for a larger batch
after spraying - When dry - rinse off leaves < don't skip !
excellent for aphid control