PP248/MG441- PP251/MG444, a 4-part series by Aaron Palmateer, Ken Pernezny, Monica Elliott and Nikol Havranek, are new additions to the Master Gardener Handbook. They provide beginning Master Gardener volunteers with methods for taking a systematic approach to diagnosis of plant disease problems. Published by the UF Department of Plant Pathology, February 2008.
Part I. Eliminating Insect Damage and Abiotic Disorders
Part II. Diagnosing Plant Diseases Caused by Fungi, Bacteria and Viruses
Part III. Managing Plant Diseases
Part IV. Plant Health Questions to Ask the Client
http://edis.ifas.ufl.edu/TOPIC_SERIES_Guidelines_to_Identification_and_Management_of_Plant_Disease_Problems