Helmut van Emden
 
Helmut van Emden is Emeritus Professor of Horticulture at the University of Reading, UK. He has researched aphids for over 50 years and has wide international experience, including in the tropics.
 
Books by Helmut van Emden :
 
Edition: 2 , 
700 pages, 7 1/2" x 9 5/8",
Cloth: 978 1 78064 709 8
Price: $290.00
Published: October 2017