The index lists both common and scientific names so it's easy to find a pest f you know its name. The book is arranged in sections so all beetles are together, then all butterfly & moths, etc, this makes it easier to find the name of an insect you have seen in the garden by matching it to the many excellent photographs. Another useful reference towards the beginning of the book is a table of common plants and their common pests, so if you have black spots on your azalea you will see that petal blight is covered on page 354. There are separate chapters on bacterial infections (such as black spot or blights), viruses, mites & fungal infections. And there are 100 pages on good 'bugs', pollinators & predators. The book is written for Australia. Once you have found your pest you will see information on its favourite food, how it breeds & its life cycle, and tips on how to control it. If there's something I'd improve it would be info on how to attract and keep the beneficial insects.