Can Spirea Be Cut To Ground For Treating Aphid Infestation

Q: Hi, I have 6 spirea bushes that have a severe infestation of aphids. I used water spray, soapy water and insecticidal soap. It is mid May. Would it be okay to cut the bushes back to the ground?

A: Cut them back to 6 inches in height. Best And Happy Yardening, Nancy