An illustrated guide to the state of health of trees : recognition and interpretation of symptoms and damage /
E R Boa ; Food and Agriculture Organization of the United Nations.
- Rome : Food and Agriculture Organization of the United Nations, 2003.
- vi, 49 p. : ill.
Summary: Insect pests and diseases routinely affect the health of trees, and major outbreaks can have catastrophic environmental and economic impacts. The effective management of all tree health problems depends on their early detection. This guide provides 140 photographs of symptoms from more than 50 tree species to be used as a basis for demonstrating the effects of pest (biotic) and non-living (abiotic) influences.