You really don't want hoppers in your garden. They are in the same family as locusts and will destroy your crops if given the chance. If you cant employ the use of chickens, I would highly recommend Neem Oil. This stuff is 100% organic and works wonders. You can spray it on the foliage or water it into the soil with your next water//feeding. Lots of pages are dedicated to Neem oil on these forums and can explain the further benefits and more of the science (if youre interested) behind this wonderful oil.