Many plants have been specially bred to resist the attacks of particular pests and diseases. Plant hedgerows and shelter belts to provide a refuge for natural pest enemies. These plants can give alternate food sources for beneficial insects and predators. When a garden is designed with diversity in mind, it's generally healthier because growing many different types of plants attracts beneficial insects that feed on destructive ones. A diverse planting also makes it harder for pests and diseases to find vulnerable crops.
Nothing succeeds like success.
As soon as you start letting a few simple nontoxic techniques go to work against insects, other steps will fall right in line and pest problems will dwindle. If you're using chemical pesticides, the first thing to do is to stop, cold turkey. Without these poisons permeating your air, soil, water, and plants, some of nature's intended protection has a fighting chance to work. Helpful insects can go back on the job. Plants themselves respond to the advantages of a natural and balanced environment as well.