Buy Proneem in flour format, I spray neemazal and apply proneem in irrigation, it takes care of it in 2 treatments, but you need to space those 10 days apart to allow for the eggs to hatch so you can kill the last generation on the second treatment.
Dosages for NeemAzal is 2ml/l, 1.5l/m2.
ProNeem it says on the package, but i had to be reading a shitload of information to figure out the Neemazal correct dosage for irrigation and its 1ml/l maximum at 10% volume of water relatively to the volume of substrate, however i recomend not going over 0.5ml/l in irrigation and if used with proneem as 1 irrigation mix don't go over 0.1ml with the neemazal but use the full dose of Proneem.
Stay lit growmie.