AQUATIC PESTS ON 

 IRRIGATION SYSTEMS 



IDENTIFICATION GUIDE 



Second Edition 



A WATER RESOURCES TECHNICAL 

 PUBLICATION 



By N. E. Otto, T. R. Hartley, 



and J. S. Thullen 



Illustrated by D. W. Cunningham 



and J. M. Evans 



U.S. DEPARTMENT OF THE INTERIOR 

 Water and Power Resources Service 



1980 



