Eric Boa
Diagnostic and Advisory Service
CABI Bioscience
Egham, Surrey, United Kingdom
Food and Agriculture Organization of the United Nations
Rome, 2003
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Definitions and descriptions of key terms
Diseases, damage and disorders
Non-living (abiotic) influences
5 Describing features of unhealthy trees
Recognizing features of ill health
Symptoms and their classification
6 Analysing the cause of symptoms
Problems in linking symptoms to causes
7 Colour plates: examples of ill-health in trees
8 Integrating different sources of knowledge
9 Technical support and advice
Diagnostic and advisory services
Collecting and sending samples
Annex 1
Definitions and explanations related to tree
health
Annex 2
Guide to useful books and sources of information on
tree health, insect pests and diseases
Annex 3
Tree hosts and health problems illustrated in the
colour plates