You may find that it is easiest to purchase and use fertilizer that is labeled for citrus. Your state Department of Agriculture can assist you with this. Testing is not necessarily required for soil contained in pots. When growing citrus, you may experience certain pests. There are many ways to control the pest population.
Prevention is the first good measure.
Healthy, properly fed trees can ward off a number of insects. If you suspect a problem with pests, we urge you to contact your local garden center or Agricultural Extension Service for identification and proper control measures. These are just a few basic rules of thumb for growing successful citrus. We recommend that you purchase a more detailed book on citrus. Books may also be available at your local library.