Pest is always the problem for every gardener and the solution is always chemical pesticides. But you will have to watch and keep your kid & pets from the toxic substances. So controling natural pest by using beneficial insects will be the good choice.

A garden insectary is a small garden plot of flowering plants designed to attract and harbor beneficial insects. These "good insects" prey on many common garden insect pests and offer the gardener a safer, natural alternative to pesticides.

The garden insectary is a form of "companion planting," based on the positive attributes plants can share in deterring pests, acquiring nutrients, or attracting natural predators. By becoming more diverse with your plantings, you're providing habitat, shelter, and alternative food sources (such as pollen and nectar), something many predators need as part of their diet.

Here's an example. You can control aphids with an aphid predator like aphidius, and you can encourage aphidius to set up shop by planting sunflowers or lupin. Of course, the aphid predators need the pests to be present in order to eat, thrive, and reproduce—that is, they need aphids to be found in and around the general area you're trying to protect from the aphids.