I had purchased some Need oil earlier this year, specifically "Fertilome triple action plus". I have been dissapointed with it, since it has not had much of an effect with my aphids, and has not discouraged any squash vine borer egg laying, and doesn't seem to exhibit the systemic properties I have read about in the web. I've wondered if I had a bad batch, or if its just overrated and not that effective. Today I found this article:
This is very interesting. The aithor explains the difference between real cold-pressed neem oil, and many of the product out there. My bottle says "Clarified hydrophobic extract of neem oil" , so its lacking the Azidaractin !! So maybe my evaluation of neem oil has not been fair! I'll plan on buying a bottle of pure cold-pressed neem oil next and give that a shot.