The best way to control insects that could potentially be pests is to encourage diversity by planting a wide variety of native plants. By doing so, no one species of insect will be able to dominate. Diverse plant life will also attract more birds and predatory insects, like ladybugs and lacewings, that will keep the numbers of pest insects under control. Providing a water source will also help attract insect predators like dragonflies to your yard. Promoting healthy soil will go a long way in preventing insect pests.
Pests tend to infest sick or weak plants.
If you have healthy soil, with a good population of microorganisms and a balance of nutrients, your plants will be strong and less likely to have pest problems. Hand-picking, sprays of water, and insecticidal soap are a just a few methods you can use. Never collect plants from the wild. You can collect seed from wild plants only if you make sure to leave plenty for natural distribution and for food for wildlife. Always be sure to get permission of the landowner if you plan on collecting seeds.