It's a real bug eat bug world out there. By encouraging and protecting the predators, you can keep your pests at an acceptable level with a lot less work than spraying. Synthetic gardeners spend a lot of time spraying to kill bugs, yet they still have insect damamge. Why not let the predators take care of your pests and enjoy the show. Eventually bugs pests become resistant to chemcials - whether they're synthetic or natural.
Chemicals are just too simplistic to keep a pest at bay for long.
Ahhh - but predator bugs are just as complicated as your pest bugs are. As the pests develop new startegies to evade being eaten, the predators are developing new ways to ensure they can catch their dinner. It's a lot harder for the pests to develop resistance to a predator than it is for them to develop resistance to a chemical. So support your local predator population. Next month I'll have more answers to common questions and challanges.