This Book Biodiversity Role on Agriculture Entomology. It is primarily about those insects that matter to agriculturists, horticulturists and foresters because the insects either attack their crops and livestock, are potential natural enemies of those that do, or are important pollinators.But I also include species that matter to humans in general because they attack them,transmit diseases or produce valuable or marketable substances. Also I include mitesas ‘honorary insects’ in attacking plants in similar ways.Insecticides and today’s synthetic fertiliserswere not very widely used and hand labour was available for crop cultivation, includingsowing and weed control; there were different crops, and the crops grown todayare quite different varieties and often sown at different times. You will find quite a lotof anecdotes in this book giving examples of such changes in pest status. Somethingelse that changes and rather more frequently is the Latin name given to a species andthe classification of the relevant insect Order. Readers with some knowledge of entomologymay be brought up short, as I was, by some of the recent changes in insect taxonomy;it is a strange outcome of Linnaeus’s invention of binomial Latin names that these arenow sometimes less useful for communication than the English common names, ofwhich very few by comparison change with time!This book concentrates on the entomology of the ‘insects that matter’.