The Royal Horticultural Society 
RHS Handbook: Garden Problem Solver 

RHS Garden Problem Solver is a comprehensive guide to establishing healthy growing conditions in your garden and tackling pests and diseases when they occur. This book identifies more than 280 common pests, diseases and problems offering a broad range of cultural, chemical and biological solutions. With detailed instructions on combating pests and diseases in ornamentals, vegetables and fruit and how to keep weeds at bay, you’ll learn how to save money, time and effort.