Again monitoring for problems is crucial. There are several good baits or traps on the market to help you determine the number of pests you have. Hanging phermone traps in your fruit trees, can help you determine when you need to spray. Hanging bright yellow sticky traps near gardenias or hibiscus can trap white flies. Shallow trays of beer strategically placed where slugs are a problem can attract slugs, where they fall in the beer and drown.
Physical barriers have some potential.
If worms are eating up the cabbage or into your greens, you can protect the plants using floating row covers made of spunbonded fabric. It allows for air-circulation, but keeps the pests out. This will work for many plants, but if you need insects for pollination, it won t work. Using a collar around your tomatoes or a band of aluminum foil will prevent cutworms from cutting off your plants. A sharp mulch such as sweet gum balls can keep soft-bodied slugs away from inviting plants.