Grow tomatoes. When you prune them, take the prunings and put them in a bucket. Add water to to the top of the prunings. Let it steep for 3 days. Strain out the prunings. The resulting tea is your organic pesticide and it’s very effective. Don’t drink it! Like all plants from the nightshade family, the green parts are quite toxic. (I’ve never done it, but I suspect you could make a highly effective organic pesticide tea from potato and eggplant leaves, too.) Spray it directly on your plants whenever you see bug damage. Do remember that most bugs you see in your garden by day are beneficial and most bugs you see by night are harmful. Try to only spray at twilight or in the dark and run the sprinklers so it washes off by day.
You can also get a pure liquid dish soap and mix it with water and spray that on plants. It will kill most soft bodied insects.
Diatomaceous earth is my personal favorite bug control substance. Again, wash it off in the morning so you don’t end up killing pollinating insects such as butterflies and mosquitoes (yes, they are important pollinators).
If there is a pond with uncut grass around it nearby, you may get especially lucky and fireflies will lay eggs in your garden soil. The firefly larvae not only glow beautifully, but they are highly predacious and will hunt many garden pests.
The very best way to get rid of bugs is just have nearby hedges and plant a swath of wildflowers around your garden. This will attract small mammals, birds and insects which will prey on your garden’s pests.