Boa, E. R. <br/><br/>
An illustrated guide to the state of health of trees :    recognitio n and interpretation of symptoms and damage /  
Eric Boa. 
 - Rome :    Food and Agriculture Organization of the United Nations,    2003. 
 - vi, 49 p. :    ill. (col.) ;    30 cm. 
<br/><br/>Includes bibliography : p. 41-45. 
<br/><br/><label>ISBN: </label>9251050201 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Trees -- Diseases and pests.