Sevin won't kill aphids, but I thought malathion would. I've had them bad too. First time I used Dawn dishwashing liquid in water, next I used Neem Oil. I'm about to spray them with Permethrin.

If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land. 2 Chronicles 7:14