When things go wrong it is not necessarily your fault. Often easier to remedy than initially thought. hold back on pulling up that prized specimen covered in insects or digging up that wilted-beyond-hope plant to consign to the compost heap. This guide will help you understand what went wrong and why and in many cases advise on how to solve the problem. The expertise of the Royal Horticultural Society is beyond doubt. On the brink of celebrating its centenary, the Society has promoted horticultural excellence and training since its inception. Written by experts in layman's terms, all pests and diseases are covered and clearly captioned photographs ensure a correct identification of the problem. Fungus, insect, animal or disease, you will soon discover the problem and the remedy. As every gardener knows, there are some instances when nothing can be done and the plant has to go - but not quite as often as you may think as you will soon discover in this visual and written guide to the topic. Lavishly illustrated and clearly captioned, this is THE definitive guide and a must for every gardener. - Lucy Watson

Author and broadcaster Pippa Greenwood is a key panellist on BBC Radio 4's Gardener's Question Time and also appears on BBC TV's Gardeners' World. She writes for various publications and has written a number of books for DK including Garden Problem Solver and The New Gardener. She has won reference book awards from the Garden Writers' Guild for Pests and Diseases and Flower Gardener. Pippa lives in Hampshire. Andrew Halstead is Senior Entomologist at the RHS Gardens at Wisley.