Organic Bug Killer

I have been trying to grow a Stevia plant. Its in a little pot, and doing ....mmmm ok. It shot up to about two feet very quickly. I did some massive pruning to get it to bush out. Its starting to sprout on the sides. (Thats what those ugly black line are showing) Now I have a pest. The Egg Lady told me they are called Leaf Hoppers. Little light green, grass hopper looking things, about inch long. I have been manualy killing them, the pinch and squeeze method. Very effective at killing them, but others follow. They also like to have a snack on my smudge sticks and other dried goodies I have in the store. I can't put anything on the dried items in store because...I dont want to contaminate them. But the Stevia plant is up for experimentation. I found some "Organic" bug killer. Made with Thyme Oil, Clove Oil, Seasame Oil, Water, Soybean Oil, Wintergreen Oil and Lecithin. Brand name is Green Light, Home and Garden Spray. With these ingredients it sounds like a "cool pick-me-up" oil blend that I could use for a massage. Have to see if it gives the stevia a spicy-bite taste. So far...no new bugs.