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Skip Neem only use horticultural mineral oil 98% Neem burns and kills. You can load up high concentration of the 98% with no consequences. It suffocates the same.
I'll say if you use it, don't mix copper with it. I did that once & burned many leaves. Follow label.However, i've used it on 2 planted 15gal citrus trees & it certainly helped leaves from getting chewed on for a while.Dyna-gro brand.