Honey Bee Diseases & Pests (3rd edition)
Every beekeeper should have on the shelf a copy of this handbook from the Canadian Association of Professional Apiculturists (CAPA). With detailed color photographs and concise text, the book outlines the life cycle, identification, prevention and control of all the major diseases and pests faced in beekeeping.
Life is an open book exam. You don't need to memorize this book but you need to remember where you keep it. Read it and absorb the pictures. When you see something amiss in your hive, look through this book to find out what it is and what to do about it.