I second Canuck. Beneficial (or Companion/Guild) planting can help you out in deterring all the pests. Some plants can/will attract beneficial predators, and others are pest deterrents. Quick list to grab could be: Garlic, Mint, Chamomille, Chrysanthemums, Coriander, Marigolds, Lavender, Dill, Basil, Rosemary...well, that's wasn't as short as I thought.
Beyond adding more diversity to your garden, you can also pick up Ladybugs, Praying Mantids and Green Lacewings. Recently, at the local ACE, they've been carrying a Ladybug+Green Lavewing combo, as well as Mantids separately. The combination of these critters will do great work st keeping your garden clean, and if you increase your companion planting they may desire to stay around longer.
There is also a spray that many people use on their plants in order to mitigate pests. It is called 'Neem Oil' and can be found at a local nursery or hardware store.
Enjoy the journey! And welcome to California!