They say the best defense is a good offense, so why not apply this principle to your vegetable garden?
Companion planting is not an exact science, but certain combinations of plants grown together seem to be an effective way of enhancing food security by reducing the chances that crops will be destroyed by diseases or pests. The smell of certain pungent plants can repel pests. Other plants attract birds and insects that eat garden pests. One plant will feed the soil with the nutrients another needs, creating balance. A few specific examples follow.
While companion planting, introducing beneficial insects, and attracting pest-killing birds to your vegetable garden will certainly help control garden pests, you may need to go a step or two further and install some barriers for plant protection.
If your homemade sprays have proven ineffective, the next step is to bring out the big guns, or in this case, the commercial organic pesticides. Chemicals are chemicals, so what is the difference between organic (natural) pesticides and non-organic (synthetic) pesticides? While both are indeed chemicals, the organic chemicals are made from natural mineral or plant substances, and most are quickly broken down and do not harm the environment over the long-term like the synthetic varieties do.
When should you use an organic pesticide? If and when everything else has failed. Start with homemade and work your way up to commercial if you have to.
Bees help pollinate your crops, and birds and certain bugs feed on other bugs that would otherwise eat your crops, so you want a bird-, bee-, and beneficial-bug-friendly garden. These helpers will not completely get rid of garden pests, but they will enhance your food security by preventing a full-blown infestation from occurring.