The best protection from insects and diseases is healthy soil, plant diversity, and restoration of the natural balance. An organic garden in good tilth will generally have no problems, but bad things do occasionally happen. See our Plant Protection Supplies section for the least toxic solutions.
The Organic Gardeners Handbook is the best book we know of for effective natural controls. The A-Z Guide has a good overview and approach and listings on specific pests and diseases. There are listed several good books on prevention, a couple on greenhouse management, a couple on permaculture and its' holistic approach.
Finally, we include our How To Grow and the Sustainable Vegetable Garden because they are your best defense - growing organic, healthy, sustainable soil and plants using the best method for long-term success.