Root aphids!!!

I believe that I have root aphids...they are black, beetle like bugs, with big antenni. I have began spraying my young seedlings two days ago...but I find at least 1-3 aphids still alive running around everyday! How long does it take for these fuckers to die...and will I be fighting them off till harvest? HELP!

Do a triple; use a neem product and buy some sticky traps & Mosquito dunks I had those fuck'n "micro roaches" jump on they ass immediately or this battle will turn into a war, the neem will slow their reproduction, the Mosquito Dunks are a bacteria (Bti) that will kill the larvae that do produce, and the sticky traps will catch the female flyers. crush a 1/4 dunk to a gallon after 24 - 48 hrs drench the soil, spray plants and top of soil with neem. don't slack off cause you stop seeing them either. what soil are you using?

You can get a product called Gnat Off that i have used and works well.
An inch of sand on the top soil works as well...I do both mate!