TY  - BOOK
AU  - Boa, Eric
ED  - Food and Agriculture Organization of the United Nations
TI  - An illustrated guide to the state of health of trees : : recognition and interpretation of symptoms and damage 
SN  - 9251050201 
PY  - 2003///
CY  - Rome : 
PB  - Food and Agriculture Organization of the United Nations
KW  - ბოტანიკა
KW  - მცენარეთა დაავადებანი
KW  - ხეების დაზიანება
N1  - 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
ER  -