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I've used Bayer Tree n Shrub, for a single application - the new formula cooked most the plants - they recovered - but those are the plants that are re-infected
I am going out today to see if I can find Botanigard or Azamax.
I want a double attack - prolly for the three harvest cycles like Ground Up said.
No....neem definitely kills em off, but for root aphids it does require heavy application over a week or so to get em all. There are stronger options out there for sure, but I like neem because it's non toxic and cheap.