I used to use Neem Oil and as far as I can remember, it was effective both as a foliar spray and a drench. I think I quit using it (2-3 decades ago) because I didn't like the odor. I still would use Insecticidal Soap. The only reason I make my own rather than purchasing it is because I am "frugal" and because I know the 409/alcohol/water solution is safe to use on my orchids.