If by 'Organic' you mean something that has been alive, like a tree, as opposed to something that has not, like granite, then here's a real easy one that actually works.

Get a pound of fag ends, pour boiling water over them, strain the liquid, then
dilute a bit more and spray. Don't eat crops for 1 week as it won't do you much good, but after then the spray will have broken down and is harmless.

This will shift just about any bug that crawls or flies.